I saw a documentary on WW1 and WW2 subs, and a British submariner in WW1 found that he could park his boat submerged just above a heavily salted layer of water and there was no need for any forward speed at all. Helped rest the crew and save battery power.
I usually travel at 50m and ahead slow when the weather is so bad that surface travel is a joke. The boat keeps that depth fine. But it seems there is some debate as to whether you need to increase the speed for increased depth.
Is it really modelled in SH3?
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