Squid (weapon)
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Squid was a British World War II ship-mounted anti-submarine weapon. It consisted of a three-barrelled mortar which launched depth charges. It replaced the Hedgehog system, and was in turn replaced by
Squid anti-submarine mortar on display at the Devonport Naval Base
Loading a Squid in 1952
Squid bomb markings diagram
HMCS Haida
Sonar
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Sonar is a technique that uses sound propagation to navigate, measure distances, communicate with or detect objects on or under the surface of the water, such as other vessels.
Squid (weapon)
…moment of launch to take into account the movements of the target. The maximum depth was 900 feet (270 m). The weapons were automatically fired from the sonar range recorder at the proper moment. The pattern formed a triangle about 40 yards (37 m) on a side at a distance of 275 yards (251 m) ahead of the ship…
French F70 type frigates (here, La Motte-Picquet) are fitted with variable depth sonar (VDS) type DUBV43 or DUBV43C towed sonars.
A sonar image of the Soviet Navy minesweeper T-297, formerly the Latvian Virsaitis, which was shipwrecked in December 1941 in the Gulf of Finland.
Fessenden operating underwater oscillator in 1915.
Bubble clouds shown under the sea. From ref.