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Originally Posted by AS
The German Navy calculated a safety-factor of 2.5 for their "operational depth", while the U.S Navy calculated with approx. 1.5.
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Calculated crush depths are not necessarily the reality. I've heard of at least one Gato surviving 600 feet and more. Also, I've seen one source that shows the German depth as twice the test depth, not 2.5. This is not to say the German boats didn't go deeper, but US boats could go quite a bit deeper than they were rated.