another animal that could be added is some kind of giant squid that can grab you like a reaper, but crush you and the only way not to be crushed is depth module mk3
Along with the idea of the rift biome being the deepest part of the map you should have that at the entrance there is an abandoned cyclops that is crushed from the pressure, and have any "mutated" leviathans that are down there albino and highly dan…