I read the posts about subs not keeping depth at very low speeds, in a way it's kinda realistic. No submarine back then had perfect control of bouyancy, so they used forward speed and planes to compensate ('Hovering' is still tricky today as far as I know). So, if your sub were to come to a complete stop, you'd either slowly sink to the bottom or float to the surface.
It would be kinda cool if this effect could be simulated, but only while stopped, seeing as silent running is only .5 kts or so.
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