Johnny Walker Diving Mines

This British weapon 72 inches in length and weighing in the 500 lb class had a most unusual mechanism of action. With a main charge of approximately 100 lb Torpex/aluminum in a shaped charge and a hydrogen gas generation system the idea was to form a large bubble of hydrogen gas that would lift a warship out of the water and 'break its back'.
Seven Lancaster bombers each carrying a dozen Johnny Walker bombs attacked the battleship Tirpitz in September 1944. No damage was inflicted and the Johnny Walkers were never used again. As ingenious as the concept was in actual use the weapon failed to produce the desired effect.

Interestingly enough 43 years after the attack the Norwegians found one of the Johnny Walker devices still intact near Kara Fjord.

http://www.ww2guide.com/bombs.shtml

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