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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.
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Yes I recon thats correct, I was thinking about the time it took to trim the boat after diving beyond the 90 meter recommended depth. Beyond 90 meters in 1930s the engineers manual for diving a boat would be void surely. I read recently they lost a uboat because someone flushed the toilet incorrectly while submergered.
I just see the equation of (time ( water quantity ( water pressure ( speed of boat )))), being harder to control at 150 meters than previous versions of silent hunter sugested.
sid