Later Developments
For the reasons expressed above, the depth charge was generally replaced as an anti-submarine weapon. Initially, this was by ahead-throwing weapons such as the British-developed Hedgehog and later Squid. These weapons threw a pattern of warheads ahead of the attacking vessel to bracket a submerged contact. Hedgehog was contact fuzed, while Squid fired a pattern of three large (200 kg) depth-charges with clockwork detonators. Later developments included the Mark 24 "Fido" acoustic homing torpedo (and later such weapons), and the SUBROC, which was armed with a nuclear depth charge. The USSR, United States and United Kingdom developed anti-submarine weapons using nuclear warheads, sometimes referred to as nuclear depth bombs (NDBs).
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