I know it's just a game but hear me out. In real life, when a submarine changes depth, the entire submarine will angle itself upwards/downwards almost 45°, forcing the crew to brace themselves while it moves. It looks pretty funny as a bunch of people practically lean on the floor to keep themselves upright. Looking like a bunch of Michael Jackson's leaning around the deck.
How possible would it be to bring this experience into Barotrauma? Perhaps, only during rapid/aggressive maneuvers, the sub would angle strongly and force the whole crew to adapt to the rocking of the ship while they conduct their tasks/fight monsters/try to repair/etc. It would incentivize the captains to navigate more responsibly and cause some hilarious scenarios when they don't.
The one BIG drawback I see in this is the sub potentially becoming stuck at such an extreme angle that players can't move, or even possibly trapping them. But, that could also easily be prevented by setting a maximum/minimum angle the subs are capable of achieving, so no matter what players can always at least walk around, even at its steepest angles.
Oh, AND, it would let nimble captains take some of the longest vessels through otherwise impassable gaps in terrain by angling the ship to slip through. That'd be really neat.
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