This IS modelled in SH3. Try maintaining depth with 1-2 knots in 200 m.

I have not noticed this behavior at all :hmm: I am driving the type II, but I have no problem keeping depth at all stop.... depth is between 50 and 100m...

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?