Squid was a World War II ship-mounted anti-submarine weapon. It consisted of a three-barelled mortar which launched depth charges. Mushroom cloud from the nuclear explosion over Nagasaki rising 18 km into the air. ... Italian barque Amerigo Vespucci in New York harbor, 1976. ... USS Los Angeles A submarine is a specialized watercraft that can operate underwater. ... The bayonet, still used in war as both knife and spearpoint. ... Mortar has several meanings: A mortar is a vessel used to contain a substance which is then ground into a powder and/or mixed with a pestle. ... Depth Charge used by U.S. Navy later in World War II The depth charge is the oldest anti-submarine weapon. ...

Literally ordered directly from the drawing board, this weapon was rushed into service in 1943 onboard HMS Ambuscade. This weapon was a three-barrel 12 inch (305 mm) mortar with the mortars mounted in series, one behind the other. The barrels were mounted in a frame that could be rotated 90 degrees for loading. The projectiles weighed 390 lb (177 kg) with a 207 lb (94 kg) minol charge. Sinking speed was 43.5 ft/s (13.3 m/s) and a clockwork time fuse was used to set the depth. Maximum depth was 900 feet (274 m) and all three projectiles had to be set the same.

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 (250 m) ahead of the ship. The first successful use was by HMS Loch Killin on 31 July 1944, when she sank U-333.