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I doubt that shouting inside a psub would be heard by a diver. A few hard
smacks on the hull with a hammer might work but not very useful because the
diver would have to be so close to hear it. Better to have a pad and felt pen so
you could write instructions and hold them up to the window like maybe how much
air you've got left or where the emergency ballast tank fill fitting is located.
Frank D.
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