Quote:
Originally Posted by maillemaker
I don't know how hard it was to maintain depth without moving,
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Pretty much impossible. Modern subs can do it, but they have computers controlling all the functions. WW2 subs leaked, so even with perfect trim the boat would start to sink withing a few hours, if not minutes. The balance for this was to maintain a slight positive bouyancy and use the dive planes to maintain depth, but then as soon as you stopped moving the boat would start to rise. This was preferable to sinking, but it's still not "hovering".