B57 (nuclear weapon)

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Developed for the U.S. Navy as both a gravity bomb but, with a hydrostatic fuze, a nuclear depth charge to deal with the Cold War threat of large numbers of Soviet submarines. 3300 were produced and deployed between 1963 and 1993. large numbers were shore-based on P-3 Orion [and other [maritime patrol aircraft]], some under dual-key arrangement with NATO allies.

Many naval analysts believed that if nuclear war could be tactical and limited, the most likely scenario was in the deep ocean, in a battle between convoys and submarines.

It was replaced (without underwater capability) by the B61 bomb.

It used PBX-9404 explosive, which was found to have reliability problems.