Escort see me without pinging

[BigWalleye]

Originally Posted by Zosimus

The reality is when you are running silent the pumps still operate. There are merely operated by hand rather than by noisy machinery. It may not be as efficient, but it's a lot quieter.

Yes, the pumps could be operated by hand. Everything on the boat except the propulsion could.But do you have a source that says that neutral bouyancy could be maintained indefinitely with hand-operated pumps? And that operating the pumps by hand was silent? Less noisy, sure, but a continuous noise source was all the escorts were listeing for. And sound travels a long way in water.

Does anyone have a published source that says that a WW2 submarine could mainatin constant depth indefinitely without operating electric motor-driven equipment? There are certainly first-person accounts (and technical documents) that indicate they couldn't.