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Originally Posted by Wolfstriked
Is it really true that a Uboat sinks when at zero speed.....I am asking about periscope depths mainly?
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It is theoretically possible to maintain depth while stationary. The problem is that this requires using the pumps, which is just as noisy if not more so than running the propulsion motors at slow speed. If it's the periscope wake you're worried about, at 2 knots the wake should be minimal, and they're just as likely to spot the 'scope itself as the 'feather'.