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Originally Posted by Drebbel
None ???? Probably depends on what you call a pen.
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Interesting. I looked up one book, "Second U-Boat Flotilla" which mentioned a raid on Lorient round about 1st August 1945 using "1,000lb 'Grand Slam'" bombs specifically designed to penetrate them. Two hits were scored with "cataclysmic" explosions but "the massive concrete shelters shrugged off the renewed assault with barely a mark".
But then I looked up "Grand Slam" bombs and found out Tallboys were 12,000lb and Grand Slam ones were 22,000lb. Where the author got 1,000lb for a Grand Slam in my book is beyond me
I know I've read elsewhere that the pens were never penetrated, but based on your pic and further online reading about the bombs I have to say those books were wrong, and so was I. Thanks for the info.