Remember USN Dept regs (applies to all things "government")? Everything in duplicate at a minimum, and sometimes up to quadruple that. One breaks, you have another. Those aren't the only depth gauges in the boat... Two planesmen, a gauge for each, "Aye sir" "Aye sir", and also so that the diving officer can see them from across the compartment if he's gabbing with the chief... Also, prior to the war, 100 feet was considered a "deep" dive, and they usually did not go that deep... why would you need to go deeper?... lol
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