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" Being quieter or even comeletely silent when sumberged."
It's not the sound of a diesel motor running that gets detected when subs
are submerged. Even small noise levels are detected. A military sub can hear
torpedo doors opening, props turning, cavitation if there is any, and possibly
even loud noises generated inside a sub. Water transmits sound very good so if
you were banging around inside a steel hull the right listening equipment would
pick it up.
Frank D.
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