Thanks to everyone who reponded to my question, It was interesting to read your opinions.
Quote:
Originally Posted by gazpode_l
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Perhaps the first figure is safe operating depth and the second is either max depth or crush depth. I'm not too sure if there ever was a 'dead on' figure for a boat's real crush depth as this would imply that they would have had to test the uboat to destruction. I guess crush depth was just estimated mathematically by the design engineers? Perhaps someone else knows more about this...
I like to refer to uboat.net for information about the German submarines, you can see their page about the different uboat types here if you are interested:
http://www.uboat.net/types/