Quote:
Originally Posted by sidslotm
... It seems to me that a boat had to power through the water at any depth else it sank, the deeper it went the hander the balance between displacement and silent speed
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They easily pumped water in and out of diving and other tanks while submerged to achieve neutral buoyancy and longtitudinal stability. Otherwise how would you control even slight flooding? And think of all excess power, battery capacity and noise you would need if you could not control your buoyancy to precise level. Even if you don't have a perfectly calibrated valve you could achieve desired buoyancy by trial and error.
AFAIK they would normally keep slightly positive buoyancy, so under low RPMs the boat would slowly float to the surface - directly opposite of what we see in the game.