I do recall
I do recall reading years ago that subs in WWII had to keep a slight forward movement going in order to maintain a stable depth level. Part of holding to a depth was done by the use of the diving planes which required at a minimum a slight forward motion. I'd have to go back through all the U-boat books I ever read to find the quote. But I recall the words of it everytime I am setting motionless at periscope depth. I am always thinking: this would be impossible in real life.
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