Petya-class frigate
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The Petya class was the NATO reporting name for a class of light frigates designed in the 1950s and built for the Soviet Navy in the 1960s. The Soviet designation was "Storozhevoi Korabl`" Project 159
A Petya-class frigate of the Soviet Navy in 1983
Anti-submarine warfare
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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 oper
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