Lost River Skeleton - Observations, Science, and things which make no sense

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  • Gamerman47Gamerman47 Members Join Date: 2018-03-18 Member: 239277Posts: 12 Freshly registered user
    Here is a list of observations I made about the skeleton

    Which one?
  • Muninn_CrowMuninn_Crow Members Join Date: 2018-02-27 Member: 238401Posts: 24 Advanced user
    edited March 2018
    On the topic of the brine and its toxicity, I belief I have found a likely answer. It is known that most creatures on earth have red, iron-based blood, while some creatures like arachnids, have blue, copper-based blood. I believe the life of 4546B shares a similar blood to that of the sea cucumber, having yellow blood died with a vanadium-based pigment called vanabin (or the planet's equivalent). Vanabin does not carry oxygen, but it is theorized that it makes the sea cucumber taste bad to potential predators, or the creature toxic to parasites and predators. If the life on 4546B features toxic blood, that would lend to the Lost River brine's toxicity as decaying matter falls into the cave. The presence of leviathans rotting away in the caves could lead to an upsurge in brine toxicity, probably following some Sea Dragon hunts.

    Vanabin is created from Vanadium, which is a quick-oxidizing metal throughout the ocean. It can be created as a byproduct or uranium, in the production of specialty steel alloys, and in the production of sulfuric acid. Vanadium is found in some Earth life as a likely toxin, and as an active center of enzymes in Earth algae. Noting 4546B's initial primary trait of enzymes, I believe that Vanadium is a key component of the enzymes inherent in the planet's life. Vanadium batteries exist in modern technology, being commonly used as rechargeable batteries. As batteries rely on an acid to store and conduct electricity, it is possible that plants like Creepvine and Acid Mushrooms store Vanadium.

    An interesting note is that the tree holding the Ghost Leviathan eggs seems to neutralize the toxins of the brine, making it safe to swim in. It is possible that the tree releases something into the water to neutralize the toxins, or absorbs it, possibly lending to a general immunity by the Ghost Leviathan to the Lost River brine. With the recent change to the Lost River fish no longer being harmed by the brine, I think it safe to assume that the fish feed on the trees or their byproduct to protect themselves from the brine, or like Clownfish, gain a protective coating by rubbing against the trees. (Dolphins have a similar practice with a specific coral for its anti-parasitic slime) [see Blue Planet 2]

    On a different topic, we have the long-lasting, surprisingly intact bones of the leviathan. We know that the Sea Emperor absorbs minerals to harden its chest plating, and provide heat resistance. It is possible that the extinct leviathan had a similar process of devouring minerals, and applying it to the bones rather than a protective shell. This is likely an extreme variant of how humans absorb iron to strengthen our bones, though too much is harmful to us. 4546B's life appears to thrive on the extremes.


    Edit: Scifiwriterguy has a great suggestion on the blood. Per my own research into cobalt for a game I'm developing, I learned that cobalt often is collected as a byproduct of dredging for copper and nickel, and that all three are found around thermal vents as material is ejected from the vents. Analyzing the terrain of the Lost River, we see plenty of nickel deposits, though copper would need to fall into the cave system from the Blood Kelp forests at the entrances. The thermal vents are present, often overgrown with pyrocoral, creating the high likelihood of cobalt presence in the Lost River.

    Edit2: Just did some quick digging on Titanium, and it turns out the metal is naturally occurring on Earth, being the ninth-most abundant metal on Earth. I have seen plenty of complaints by others of Titanium being found in-game, with the belief that it is a purely man-made metal. Titanium forms in igneous rock, which explains the sheer abundance in and atop 4546B's undersea volcano, either in large deposits, or in minute clumps. Titanium has no biological purpose for Earth life, yet is found is surprising concentrations. 4546B's creatures likely have concentrations of Titanium, which poses another likely metal for the Sea Dragon to absorb for its chest armor, and for the Lost River titan to absorb for its bone density, resulting in the longevity of the extinct leviathan's skeleton.
    Via the "Bioinorganic Chemistry of Titanium" published by ChemicalReviews, we can see from the Table of Contents that titanium has been found in fossilized teeth, and is (as with most things) found in sea sponges. While it is not known what purpose organisms would require titanium in their systems, I find it probable that this is what the armored species of 4546B rely on to defend themselves, and tear through our titanium habitats and subs.
    Post edited by Muninn_Crow on
    ShuttleBugMaalterommIsummon_Durt
  • MaalterommMaalteromm BrasilMembers Join Date: 2017-09-22 Member: 233183Posts: 537 Advanced user
    @Muninn_Crow
    Very good.
    A few questions though.
    - If the life on 4546B features toxic blood, that would lend to the Lost River brine's toxicity as decaying matter falls into the cave.
    - I believe that Vanadium is a key component of the enzymes inherent in the planet's life.
    Vanadium is highly toxic, how can we consume raw food from fauna and flora in the game?
    Edit: Scifiwriterguy has a great suggestion on the blood. Per my own research into cobalt for a game I'm developing, I learned that cobalt often is collected as a byproduct of dredging for copper and nickel, and that all three are found around thermal vents as material is ejected from the vents. Analyzing the terrain of the Lost River, we see plenty of nickel deposits, though copper would need to fall into the cave system from the Blood Kelp forests at the entrances. The thermal vents are present, often overgrown with pyrocoral, creating the high likelihood of cobalt presence in the Lost River.
    Even in the presence of enough cobalt to justify the use of coboglobin, it does not seem to bode well with very cold or hot environments, both fairly common in the game.
    It has a much shorter lifespan than its iron and copper counterparts, and both metals are readily present as metallic deposits in the game (cobalt shouldn't be present in metallic form anyways, even if it could be present in association with other minerals). I'm just trying to point out that it is suspicious that it beat its competition to become the chief globin.
    It would be nearly as crazy as suggesting the creatures do not breath oxygen, even though it is readily available in the atmosphere.
    Just did some quick digging on Titanium, and it turns out the metal is naturally occurring on Earth, being the ninth-most abundant metal on Earth. I have seen plenty of complaints by others of Titanium being found in-game, with the belief that it is a purely man-made metal. Titanium forms in igneous rock, which explains the sheer abundance in and atop 4546B's undersea volcano, either in large deposits, or in minute clumps. Titanium has no biological purpose for Earth life, yet is found is surprising concentrations. 4546B's creatures likely have concentrations of Titanium, which poses another likely metal for the Sea Dragon to absorb for its chest armor, and for the Lost River titan to absorb for its bone density, resulting in the longevity of the extinct leviathan's skeleton.
    Titanium isn't the best insulator, although it has many other advantageous properties which might justify its use. And even with the best insulator out there, the Dragon would still need either an effective way to shed off heat or display a very high body temperature (to the point of being extremely exotic by Earth standards).
    Maybe the Dragon has some sort of "biological thermoreactor" (almost scifi magic) and is able to extract energy from the surrounding heat, only resorting to feeding when in need of specific nutrients.

    I have no suggestions regarding the millions years old skeletons, or how they might be preserved. Maybe some sort of mummification process on the already very sturdy bones.
    Bear in mind that the few million years suggested in the game is quite a short time for adaptation and evolution on real Earth. Which suggests major ecological changes might have transpired prior to the precursors arrival.

  • Muninn_CrowMuninn_Crow Members Join Date: 2018-02-27 Member: 238401Posts: 24 Advanced user
    edited March 2018
    I thank you, Maalteromm, for your questions. I am always happy to find others willing to pose thoughtful questions. (much less partake of scientific debate! ^^) It also prompts me to learn new things for my rebuttal. XD

    To answer your question, I did a bit a digging into Vanadium. Via the abstract for a medical paper on the role of Vanadium in the human body, I learned that it is present in all life on Earth in some amount. The human body carries an average of 1mg of Vanadium, an amount which is nontoxic to humans, and serves in a regulatory function in metabolic processes depending on phosphate levels. Vanadium is most commonly absorbed into the body via the gut, and on 4546B, I could guarentee that we would be absorbing an awful lot of Vanadium by eating the local fish.
    Vanadium is distributed through the body via the bloodstream, in which is speciates (mutating into two forms) into either Vanadate, or Vanadyl. Our bones act as a storage pool for Vanadate, and it also stabilizes tissue. A medical benefit of Vanadium is its anti-diabetic effect, as well as anti-cardiac and neuronal disorders, malignant tumors, and bacterial infections. (Sounds a lot like Enzyme 42, doesn't it?)
    In regards to eating fish containing potentially higher concentrations of Vanadium, I imagine one method to reducing the concentration would be to drain the blood and gut the fish. As we use a fabricator, there is a chance (based on the construction animation) that the food is being rebuilt without the known harmful components or concentrations. Most likely, the fish is simply being cooked and it is up to us to know what not to eat. In fish and mammals, the liver is the first line of defense against toxins in the body, followed by the fat. Removal of guts and fat are likely the best means to remove heavy concentrations of toxins. Vanadium is most prevalent in the organs, blood, and bones in some form, and those are not commonly eaten (Unless you are really desperate, or it is cultural). I'm going to have to reconsider those Peeper eyes now.

    I agree with you on the cobalt. It is most likely in particles mixed with the sand, since we do not find deposits of it, if it is present on 4546B at all. I do not know the evolutionary path of blood types, so that is certainly an interesting topic to look into. I'm not sure if any major research has been done on that to date.

    Unless we can figure out what other minerals would lend to strong bones in the deeper ecosystems, I think Titanium is our best bet. I agree that it is a peculiar choice. It is known for its high-strength, light weight, and resistance to corrosion, which is why I think the Lost River skeletons may contain it. (Look at that compression!) If the parasites burrowing into the bones are any indication, they've had a long, long time to dig into those bones and they have barely scratched the surface. Titanium is not prone to bending, and is used in shape-memory alloys. It has a melting point of 1668° C (3034° F) as pure Titanium, whereas magma usually ranges between 700-1300° C (1300-2400° F), so it won't be melting inside the Active Lava Zone's various fish, even when they take a dive into the magma. The Active Lava Zone has water temperatures of 60°-70.5°C (140°-1300° F), whereas most hydrothermal vents have a temperature of 400°C (750° F). I believe the Active Lava Zone's temperatures are underwhelming, but oddly, at 60-70° C (140°-158° F). It's a very hot bath. On Earth, the standard boiling temperature of water at sea level is 97° C (212° F), and decreases the higher up you go. But go 1000m under the ocean, and the boiling temperatures increase to about 101°C (214° F). This is a slight increase, but still much higher than the Lava Zone's temperatures.
    The volcano on 4546B is probably a dying one, as the internal temperatures are not that hot, which may lend to why life can continue to thrive within. At such temperatures, I don't think the fish need to worry too much about their thermoregulation, with the exceptions of the Lava Lizard and Sea Dragon Leviathan, who physically interact with magma. Their interaction is often brief, which is survivable, but invariably leaves scarring. This may have been turned to an evolutionary advantage as the Lava Lizard's magma-scarred armor, and the Sea Dragon's magmaball attacks.
  • MaalterommMaalteromm BrasilMembers Join Date: 2017-09-22 Member: 233183Posts: 537 Advanced user
    I thank you, Maalteromm, for your questions. I am always happy to find others willing to pose thoughtful questions. (much less partake of scientific debate! ^^) It also prompts me to learn new things for my rebuttal. XD
    That's precisely the idea.

    I don't have time right now to answer your very through comments, but I'll try to come back to it later.

  • Isummon_DurtIsummon_Durt Lower MiddleEarthMembers Join Date: 2017-12-09 Member: 234349Posts: 301 Advanced user
    Nice work, @Isummon_Durt. :)

    The Lost River creature that gave us the Gargantuan Fossil as the wiki calls it (I call him Snaggletooth - he's my little Lost River mascot) is a weird one, but some suppositions can certainly be made, and several of those put forth certainly hold water. (No pun.) I'm going to have to disagree on a few points, though. (Science and point-by-point stuff in the spoilers sections as usual.)

    The big one is the assumption that the biology of 4546B is similar to Earth's - it isn't. There are some phenotypical similarities, but it's a radically different biology all the way down to the basics.
    Principally, the biochemistry of 4546B is way, way off the Earth baseline. Every creature in the game, when injured, bleeds yellow. This is in stark contrast to Earth, where the two most common blood colors outside of the class Insecta (which contains all insects) is either red or blue. This is because iron and copper are both common and readily bioavailable here on Earth, leading to hemoglobin (iron-based, red blood) and hemocyanin (copper-based, blue blood). Yellow is a weird color from a terrestrial standpoint because yellow-colored oxygen-carrying pigments are rare and require specific (and less common) components. Specifically, on Earth, the closest we have is coboglobin, which appears yellow when deoxygenated (whereas human blood appears dark, dark red) and is clear when oxygenated. The catch is that rather than plentiful iron or nearly-as-plentiful copper, coboglobin is built around cobalt, which is a little hard to come by. It's why coboglobin is so rare in on Earth. Insects also have yellow-tinted blood, but that's not blood at all; it's hemolymph, and doesn't have oxygen-binding pigments like true blood. It's a result of an open circulatory system, which gets kinda complicated and isn't entirely germane to this discussion. Still, if you want to know, ask. :)

    The widespread incorporation of bioluminescent compounds in macroorganisms is another substantial departure from Earth biology; here, only organisms that live largely or exclusively in the midnight regions of the oceans or in lightless caves exhibit noteworthy bioluminescence. It's a tricky and biologically expensive trait that, apart from those specific environments, serves little function.

    Finally, the sheer lack of structural diversity is also an eyebrow-raiser. Most of the organisms on 4546B follow one of only a handful of basic structural configurations: eel-like, ray-like, bony fish-like, and arthropod-like. Mammalian life seems entirely absent, as do a whole host of other classes in Terran taxonomy. It's a weird setup which we can explain (or at least handwave away) by saying the planet used to be more biodiverse but the carar led to mass extinctions.

    So, while some of the creatures on 4546B look reminiscent of things we have here on Earth, it's only skin-deep; their basic biochemistry is substantially different, their evolutionary tracks are different, and, well, they're the products of an alien ecosystem. Having terrestrial-pattern creatures everywhere in the galaxy is a symptom of lazy writing, but people accept it because of Star Trek.

    Points with which I have no quarrel at all: estimated size of 1200m; resultant extreme caloric requirements; a possible ancestor of stalkers; it's not an eel.
    It's big, and big things need lots of fuel. There's a pretty clear - although not conclusive - comparison of the dentition on the skull with a stalker, and while the skull is heavier and shorter, it's not difficult to see how selection pressure could favor the longer-snouted, thinner-boned architecture of a stalker over time, particularly in the environments they inhabit.

    Realistically, this creature could represent a common ancestor of stalkers and reapers; millennia of evolution could easily account for the minor phenotypical differences. However, it's worth noting that nature favors forms which are most efficient for a given environment, so parallel evolution cannot be entirely discounted, either.

    A particular thumbs up is due for the statement that it's not an eel. It almost certainly isn't, and, as stated, it's likely a reptile. Specifically, an aquatic legless lizard. Legless lizards are often mistaken for snakes but when you take one apart, its skeleton is the same as a lizard, just minus the limbs. In the case of the skeleton we see, this is a good explanation, particularly as the ribs appear to be bony and not some lesser structure.

    Where we start to diverge: So ancient as to be an ancestor to rays; went after smaller prey; stupidity; body shape.
    While unlikely this thing is an ancestor - however deep - of rabbit rays, we can't rule it out entirely without some detailed testing like a genetic panel. (This is also why modern taxonomy is in such an uproar; bad things happen when you make assumptions based on how something looks.)

    Something this big is going to need to do one of three things, or a combination: eat literally tons of small prey, go after larger but more dangerous prey, or have one damn slow metabolism. Humpback whales get by with filter feeding despite having a body weight around 66,000 pounds. They strain out plankton, krill (a favorite) and small fishes from the water as they swim, consuming an average of 5,000 pounds of food per day. The bigger the critter, the more they need to pull in; blue whales eat up to 8,000 pounds of the same foods per day. Now, Snaggletooth was about 1,200 TIMES the size of a blue whale, so if its total mass and metabolic rate were anywhere near comparable, it'd need to choke down about 4,800 TONS of food per day just to break even. That's a lot. So it's unlikely; unless there were some much larger and/or more energy-dense prey back when it lived, it would've depopulated the planet by itself. Ergo, its energy demands weren't that extreme. The two easiest ways to jack down energy requirements are to eliminate endothermism (go "cold-blooded") and let the thing sleep a lot. Crocodiles are a good example here. They eat infrequently, sleep much of the time, and their body temperature fluctuates with the environment. That saves a lot on caloric requirements, probably enough to make this thing plausible. The other thing we can do is assume that Snaggletooth didn't hunt. Considering its body shape, dentition, and likely caloric needs, patrolling looking for prey would be wasteful. Instead, it's more likely it was an ambush predator, hiding in its cave and snapping on anything that moved close enough to be eaten. Ambush predators have very modest caloric requirements compared to mobile predators, and would explain a lot in this situation. So, when you shuck right down to it, giant alien moray eel (but not an eel).

    "Stupid" is a relative term, but could it have even approached sentience? Maybe. Sapience? Probably not. A sentient creature experiences its world subjectively, and that does not require "intelligence," merely consciousness, so we can take that one almost as a given. (Sci-fi notwithstanding, "sentience" is not exactly an accomplishment. If it's operating on anything better than reflex, it's sentient. Your dog is sentient. The earthworm he's eating is not.) The problem here is that the thing is so dang big, almost too big. Titanosaur Argentinosaurus huinculensis was only 39.7m long, so that's not even in the running against a blue whale. This monster has its size working against it for one basic reason: its nerves. In your body, the fastest nerves are involved with proprioception - your ability to know where all your bits are in 3D space so you can move, interact, and basically live as a human - and they top out at a conduction velocity of 120 meters per second. At 1,200 meters long, if you bit Snaggletooth on the tail, it'd take 10 full seconds for that message to get to his brain, and another 10 back for a response. And 120m/s is about the best we can do on Earth (or at least that we've seen). And the whole dinosaur butt brain thing? Yeah...total myth. So we're stuck with one of two possibilities: a distributed nervous system or a damn slow central one. Given the size of the skull's potential braincase, I'd personally lean toward a distributed nervous system with ganglia handling local operations. (This is the "secondary brain" system @ranmafan mentioned, although they're entirely reflexive and don't make decisions; they're not "brains" so much as a "wad of neurons.") Of course, this means operating largely on reflex, and there goes sentience out the window. But if you do that, you don't need a spinal cord anymore, which would mean this thing was either an invertebrate or was the weirdest damn vertebrate that ever lived. If it's really an invertebrate, then it's a eel with bony ribs (which transcends weird) or is something for which we have no terrestrial analogue.

    Lastly, we can't assume a flatter body shape regardless of its thermoregulation. Lizards are flatter so as to be more thermally efficient while basking. But human beings are also flatter than round for entirely different reasons. Most creatures are flattened.

    Disagree strongly: position of spinal cord; eye count; depth limit; skull fins; precursor trolling.
    A spinal cord technically can be placed just about anywhere, but it needs to be protected and can't get in the way of other structures. Having one installed on your ventral side is a whole lot of problems. So where's the spinal column? @Muninn_Crow had a decent hypothesis, although that kind of torque on the neck would be problematic (the skull should've ended up on its side rather than spun 180 degrees.) Assuming it's not the mutant bony eel possibility, it's still there. I just blame Hollywood for the confusion. See, skeletons aren't naturally articulated, and that skeleton has been there awhile. Once decay takes out connective tissues, a skeleton just kinda...falls apart. Take a look at a whale fall sometime. It's a pile of bones, not a skeleton that could be recognized. It's entirely possible that once the skeleton dearticulated the vertebral bodies just fell into the mud and sank.

    Assuming one of them isn't a sinus of some kind, I count six eye sockets. Of course, it's possible that one of them is a sinus for cooling the brain (brachiosaurus did the same thing), but it's unlikely. They all look like orbits.
    There's very little to limit Snaggletooth's depth, even if he is somehow an air-breathing creature. Whales don't get the bends (or "fizzy seltzer blood" which conjures up such a great image - I used to use cherry soda for classroom demonstrations for just that reason). Decompression sickness only occurs when you perform gas loading while under pressure. In English, that means that only if you're breathing while under pressure can you get the bends. Whales take a deep breath on the surface, dive, swim, and resurface to exhale and do it again. Human freedivers do the same, and despite falling to depths of up to 214 meters (that'd be Herbert Nitsch) they won't get the bends either. Only by breathing gas at depth does the blood load more gas than it can hold at surface pressure. (It's also worth noting that the gas involved is nitrogen, not oxygen. Pure oxygen can't give you the bends. It can kill you in no fewer than a half dozen other ways, but not the bends.)

    No way to tell what the soft structures of the creature looked like. Without an actual, preserved-in-situ fossil to work with (like a mud fossil) we can only make educated guesses based on skeletal structure. Nothing on that skull necessarily points to fins.

    I really doubt the precursors had the inclination (or the time) to fool around with a skeleton to convincingly confuse some alien paleontologist that may or may not survive being shot down by their giant flashlight from hell.

    Boom! Done! Made a concept art for the Alphasnaggle, (as it has been designated by a... strangely-minded jury,) and have only to mess around with the doodles digitally. If, that is, I have the patience to finish this. Note: Since I did the doodle in class, it's not the best proportioned. I also went with my description of its movement if it didn't have a true spinal cord.
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  • MouseMouse The Lighter Side of Pessimism Members, NS1 Playtester, Forum Moderators, Squad Five Blue, Reinforced - Shadow, WC 2013 - Shadow Join Date: 2002-03-02 Member: 263Posts: 3,567 mod
    Maalteromm wrote: »
    Titanium isn't the best insulator, although it has many other advantageous properties which might justify its use. And even with the best insulator out there, the Dragon would still need either an effective way to shed off heat or display a very high body temperature (to the point of being extremely exotic by Earth standards).
    Maybe the Dragon has some sort of "biological thermoreactor" (almost scifi magic) and is able to extract energy from the surrounding heat, only resorting to feeding when in need of specific nutrients.

    Could its fire balls be a form of temperature management? With it gathering excess body heat and then expelling it as a fireball.
    -/AUS/- PS_Mouse
    Skope
  • BIPPITYBIPPITY EnglandMembers Join Date: 2015-06-06 Member: 205283Posts: 133 Advanced user
    edited March 2018
    Anyone pick up on the fact that the upper and lower front canines are perfectly in line and would prevent it from ever closing its mouth. Which it also wouldn't be capable of because it doesn't have a joint between the mandible and the skull.
    Yeah this doesn't really mean anything I'm just highlighting that these skeletons are very poorly designed.
    I spent too much time editing the wiki
  • Isummon_DurtIsummon_Durt Lower MiddleEarthMembers Join Date: 2017-12-09 Member: 234349Posts: 301 Advanced user
    BIPPITY wrote: »
    Anyone pick up on the fact that the upper and lower front canines are perfectly in line and would prevent it from ever closing its mouth. Which it also wouldn't be capable of because it doesn't have a joint between the mandible and the skull.
    Yeah this doesn't really mean anything I'm just highlighting that these skeletons are very poorly designed.

    Well, considering the fact that the skull, https://sketchfab.com/models/25c877f195ee41ccaa85c2cdd2f847ad
    doesn't appear to have an opening into its throat either, we can by either be certain that we've been trolled by precursors or that a lot of the Alphasnaggle's decayed flesh had fossilized or has been preserved due to its components.
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  • subnauticambriansubnauticambrian U.S.Members Join Date: 2016-01-19 Member: 211679Posts: 847 Advanced user
    Wow, I hate to res a post from so long ago, but this is fantastic! As a budding paleontologist I've been fascinated with those lost river skulls, and I love to see the in-depth conversation about them!
    Paleo/Bio nerd. Big fan of Subnautica, particularly the creature design.
  • DolphinShoesDolphinShoes Members Join Date: 2020-03-15 Member: 258777Posts: 1 Freshly registered user
    edited March 15
    I pretty much agree with all of your assessments, but I like to try and make unrealistic things in games like this seem more realistic, so I'll give a crack at trying to rectify some of these issues. The first and most obvious solution to the gargantuan size is simply that the bones have been rearranged and stretched over time, and so they are spread out more than they would have been in real life, or essentially it's skeleton is stretched just so as to make it appear longer than it would have been when it's alive. Some sort of river current or the like could have spread the bones out, and thus it would be shorter and more compact in real life. Thus, the length of the creature being 1200 meters, which is absolutely absurd (a whale on earth is like 30 meters long, and the longest creature is an eel which is like 55 meters long), could be shortened dramatically to something more sensible or at least realistic, explaining this particular problem. The second thing is that if it's body plan is more like an eel instead of a whale, it could afford to be extremely skinny, thus explaining the length; while if it had something like the thickness of a whale it would be almost impossible for it to be this big (crushing under it's own weight and needing an infinite amount of calories), if it was hollow on the inside, and could expand, like an Anaconda, or perhaps like say even a puffer fish, it might be extremely skinny, but it's ribcage could expand to make it appear larger, and it simply was fossilized this way. Puffer fish bodies do have bones, and they have overlapping rib cages that allow it to expand, rather than are full of just gas, so it makes sense it may end up the same way. This would also explain it's strange upside skeleton ribcage, as we are looking at only one small part of it, and also explain the spikes coming out of the top of it, as it would have multiple overlapping ribcage bones like a puffer fish. Since it would be competing with other leviathan creatures, being able to swell up to a large size and having a lot of spikes on it would help it in defense, and also keep away smaller prey.

    With it being largely hollow on the inside, this can explain it's gigantic size without it being so big it crushes under it's own weight, can't circulate blood and oxygen and so on. This large size would also enable it to swallow massive prey, like an eel or snake, and thus allow it to eat the foods it needs to sustain itself. Most likely it probably would filter feed like a whale or whale shark, but occasionally feed on prey, similiar to the whale shark which has been shown to feed on massive schools of fish, or swallow and digest animals with it's mouth open. With many rows of teeth, it could kill them once inside of it's mouth, and like many types of turtles, could have teeth lining it's way all the way down it's throat. To be this large it would need to be like a worm, with multiple hearts and possibly even gills to help absorb oxygen, and the ability to breathe through it's skin. On a planet or moon with lower gravity (the earth's moon has 1/6th the gravity) and higher oxygen (earth used to have 40% oxygen, and insects were gigantic back in the day, with dragon flies being up to 3 feet wide), animals could in theory swell up to massive sizes. It wouldn't be surprising to find on say, titan, that there are gigantic whale like creatures there, that with the lower gravity would favor longer, skinnier more eel like creatures, as they wouldn't need to hold up their own weight and thus if much thinner, wouldn't be nearly as weak when moving in water. They also would expend less energy when moving, and thus need less calories, and given how big they are could have much more surface area, absorbing and dissipating heat much more easily, allowing them afford to be so large. As many of the creatures in subnautica are eel-like in nature and the planet is essentially a moon, this is consistent with the story. The creature may have an incentive to swell up to such gigantic sizes to help it to filter feed, hence it's inside is mostly hollow and it only has so many feet of tissue surrounding it's otherwise massive oversized body. It likely would have rows of teeth all along inside it's body to help kill and digest prey. To protect against smaller parasites and predators simply burrowing through the creature and it having no defense against them giving the fact it's overly large, it would probably need a bony exterior with spikes on it, to prevent creatures from chewing through and burrowing in to it where it can't reach. Bones also serve as an energy reserve and many bony fish were known to be able to swing extremely long distances at high speeds because of this, so this could also help the creature conserve energy. This would also explain why there are so many disconnected bones and pointy ends, especially at the rib cages, all over the animal.

    The very fast day night cycle might also explain the presence of multiple eyes on so many large animals despite so few existing on earth (eyes can be up to 20-40% or more of brain power, so extra eyes are a waste of brainpower and difficult to focus with), and the high salinity would also explain the incredibly powerful electrically oriented creatures, such as the electric eel (way more electrical than eels in real life), or the crabsquid. With extremely high salinity levels electricity could be conducted much more easily, and thus electrically oriented creatures, and likely electrical tracking in the way a shark does with electrical signals would be far easier, and have the signals also travel much further, allowing for the detection of prey far more easily. This could also explain the telepathy-like ability presented by the Sea Emperor; with a brain that develops extremely strong electrical detection and communication systems given it's ease of transmitting it through the water, something akin to telepathy would be possible, although if it's compatible with humans or other aliens is another question entirely, and would only work while in the water (thus not working while the individual is in space like is portrayed in the game). This would allow creatures to travel extremely long distances and still stay in contact with each other and find prey, which would explain the massive leviathan creatures that live on the crater's edge. These creatures could also grow to such mammoth proportions given a lack of natural predators and the presence of an abundance of microorganisms, and thus allow them to grow to enormous sizes given the presence of nearly unlimited food. As there would be little multi-cellular life, there is likely going to be a higher presence of microorganisms, likely explaining the higher oxygen content as well. The oceans like on Titan may even be hundreds of miles deep, thus allowing for an even greater abundance of microscopic organisms, and only allowing for a small amount of multi cellular organisms, requiring they are quite large. The moon's surface area is about 1/14th that of earth, and it's entire surface area is only roughly the size of asia, so while a single creature traveling from one side of planet to the other may sound absurd, it would actually be quite easily feasible. Thus, organisms which travel over the planet filter feeding to eventually wind back up on the one exposed piece of land to breed and lay eggs may not be that incredible. Plenty of animals, such as sharks, turtles, and whales migrate thousands of miles each year, and some even cover the distance of almost the entire earth, with whales easily exceeding 5000 km in distance. With a larger animal dependent more on traveling the open ocean, this does not seem as absurd.

    So, combined with the low gravity and high oxygen (possibly up to 40-80%, and several times denser atmosphere (being thicker than air as well), as well as with potentially more oxygen dissolved in the water itself), the fact it's body plan can be more flimsy, the fact it's designed to balloon up, and the fact the skeleton is stretched out in it's fossilized form, could result in something that gigantic existing. It's awkward skeleton could be due to the fact that bones are missing and the fact it has multiple overlapping bones to allow for it's expansion like a puffer fish or snake, and thus allow it to eat and very slowly digest food as well as ward off predators, designed to be so large to scare off other predators. A likely filter feeder with the occasional food, it would be somewhat ironically a less effective predator and more designed to appear large for intimidation, only using it's large size to eat much smaller prey rather than be powerful and take on stronger prey, with the larger bony fish being more likely to be an apex predator. It's large size would make it hard to kill, as well as it's spines and long skinny body offering agility, giving it an advantage on the defense. One possible explanation for the creature that is as large as it is, would be it having snaked it's way in to the cave (eels also live in caves and stay dormant for very long periods of time, consuming very little energy), it eventually got stuck down there as it became too large, and stayed in place. Staying in place for so long, it could have simply absorbed creatures with it's mouth opened and filter fed with a current streaming in to it's mouth, relying on food brought to it by the underwater river, and even eventually had it's bone fuse together with it's mouth agape for so long taking advantage of the free food, explaining it's lack of certain bones or the fact it remained upright during fossilization as it's bones fused together after sitting still for so long. Like a tree, or coral, it could grow to even larger sizes if it rarely needed to move, and with it being on it's side instead of needing to grow upwards to fight gravity, could afford to be even longer than a tree. Thus, a 300-400 meter long, or perhaps 1200 meter long if fully stretched out, animal could be theoretically possible. This may represent one of the largest specimens if it was stuck and simply sat in the same spot filter feeding, while most simply did not get this large.

    So, for some calculations, a blue whale, the largest animal on earth, is about 400,000 pounds and 30 meters long, and so to be 300 meters long, it would need to be a minimum of 4 million pounds, however, being bigger around as well, proportionately wider and taller, it would need to be even more than this, so potentially assuming 10 times as wide and tall, this would be 100 times bigger as volume scales exponentially, and thus the creature would need to be at minimum 400 million pounds, well beyond anything on earth by such a ridiculously wide margin to be almost impossible. However, if going by the body plan of a moray eel, this is not as difficult. A moray eel is typically only 60 pounds despite being 3 meters long, and if 100 times longer at 300 meters, would be only 6000 pounds, although granted, would be much skinnier. Assuming it's hollow in the middle and is not completely full of flesh (a lot like an anaconda as well), and it's a few times thicker in the flesh area, being roughly 30 meters across, it would be 100 meters around, or roughly 300 feet, which is
    about 300 times that of a moray eel, which assuming it's 5 times thicker, would be about 5 x 300 x 30 times bigger, and thus only about 2.7 million pounds, assuming 60 pounds for the same amount of flesh. This is quite doable and only marginally larger than a whale, and possibly it could be larger than this, or shorter in length and so on and so forth. The main difficulty lies not in calculating the volume the way you would normally, as we are presuming it's mostly empty space in side as it puffs itself out to appear larger.



    Something I find a little funny as well is that the bones likely would not be sticking up after all these times and the head would not have the jaw pointed up, as the tendons and muscles in the mouth would be gone, thus leaving behind a pile of bones NOT in an action pose, which is a primary issue in and of itself, but it is possible as well that it was buried in rock and then uncovered by the precursor alien race, as were the other bones, so they simply were not lying there at first, but have been exposed after a later time. In fact, with that concept in mind, it's possible the entire or large parts of the cave systems were caved out by the precursors, perhaps for study and to get to the inactive lava zone. This makes the most sense as to why it's exposed and potentially even fossilized, as if the creature simply died millions of years ago and was buried in sediment, and they dug it up, it would explain it being in roughly the same position. The precursors may have done a scan of the are and found some bones, and then dug down with their machinery to study it, clearing out as much dirt as possible. The most likely reason is that the Development team just thought it looked cooler that way, as to begin with it was more like a pile of bones with the head turned sideways. Another thing is that it probably looks smaller; the rabbit ray is supposed to be over 2 meters long, but looks like half the length of the player, or less than a meter in the game. I've noticed everything looks 3 times smaller than it says, and recognizing this, the game developers probably compensated to make it look way bigger. With a change in the Field of view and using VR, it might look closer to how it's supposed to, but as most players don't play it this way, they probably sized it up to make it appear much larger. Hence why it's so ridiculously huge.
    Post edited by DolphinShoes on
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