The problem isn't just the speed. In real life water can leak in, creating negative bouyancy. They tried to trim for positive to counteract it. The problem is that you never run at 1 or 2 knots unless you're 'silent running', which means NO PUMPS. Pumps make a lot of noise. NYGM's negative bouancy 'Anti-Hummingbird' mod is more realistic; not because it goes down instead of up (either at random would be nice), but because it keeps doing it - it doesn't stop after two or three meters.
Best of all was Aces Of the Deep's 'silent running' mode: after a while you would start to sink, and the Chief would say "Impossible to maintain depth unless we turn the pumps on", at which point you had to either sink or secure from silent running.
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