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 the Limbo system.
Squid anti-submarine mortar on display at the Devonport Naval Base
Loading a Squid in 1952
Squid bomb markings diagram
HMCS Haida
Anti-submarine warfare is a branch of underwater warfare that uses surface warships, aircraft, submarines, or other platforms, to find, track, and deter, damage, or destroy enemy submarines. Such operations are typically carried out to protect friendly shipping and coastal facilities from submarine attacks and to overcome blockades.
Royal Navy officers on the bridge of a destroyer on convoy escort duties keep a sharp look out for enemy submarines during the Battle of the Atlantic, October 1941
An example of an anti-submarine net, once protecting Halifax Harbour, Canada.
11-inch Howitzer Mk. I on British armed merchant cruiser HMS Patia in 1918, it had a range of just about 600 yards (550 m)
A depth charge thrower being loaded, aboard corvette HMS Dianthus, 14 August 1942