Also worthy of consideration is the fact that once the U-boats pressure hull is holed she is no longer able to submerge....in effect no longer a submarine and easy prey to aircraft and or naval units.
A Type VII pressure hull thickness was between 18.5mm and 21mm depending on version.
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Wise men speak because they have something to say; Fools because they have to say something.
Oh my God, not again!!
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