The Tallboys and Grand Slam were used a great deal against U-boat bunkers in occupied France. The bunkers were too massive to be more than superficially damaged, but a few U-boats were sunk by the giant waves they created washing into the U-boat pens and swamping the deck hatches. After a while, all U-boats were ordered to remain rigged for diving when in the pens with the exception of essential resupply / maintenance and the conning tower hatch.
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