I was at a full stop, using the sub as a base while farming resources.
Can't even change the batteries without falling to 350ish feet through the ship.
I don't have any hopping, but I notice after a few seconds of standing still that I appear to be subtly floating as the interior of the sub slowly bobs and moves slide to side, then instantly I'm falling in the darkness beneath the cyclops.
I…
This issue was reported in May 2015 and its still happening.
I have been constantly falling through my cyclops, down a 150' ish... I hear and splash and I'm back to swimming... or I just hit the ocean floor and take a bunch of damage.