I have to agree with Chromatix in that there is something to be said for building on the real physics right from the beginning. In particular, I would like to talk about buoyancy as I feel Chromatix has got the propulsion line taken care of.
I do not believe it would be too difficult to manage buoyancy simulation even with the tens of tanks built into the submarines of the era. Indeed buoyancy and trim were and remain easily calculated by hand and are therefore well within our computers abilities.
Although no engineer my self, I would be glad to throw out some equations or perhaps even a working algorithm if required.
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