When it comes to vehicles ending up in places where they don't belong, prawn suit "forever-falling", or seamoth clipped into wrecks or terrain, there really is no salvaging it. If you make the mistake of saving in such a case, I recommend cutting your loses: 1. See if you can access the storage locker and unload your seamoth 2. See if you can access the upgrade module locker and pull your upgrades 3. See if you can access the power cell and pull it too. Finally, see if you can destroy the vehicle so it isn't there chewing up FPS for no reason (or having a permanent reminder of a bug that should never happen in a game). You can warp yourself (the human) out of bug purgatory, but not your vehicles. Sorry, but the game has killed your seamoth.