An attack submarine or hunter-killer submarine is a submarine specifically designed for the purpose of attacking and sinking other submarines, surface combatants and merchant vessels. In the Soviet and Russian navies they were and are called "multi-purpose submarines". They are also used to protect friendly surface combatants and missile submarines. Some attack subs are also armed with cruise missiles, increasing the scope of their potential missions to include land targets.
HMCS Windsor, an attack submarine of the Royal Canadian Navy
USS K-3 with BQR-4 sonar dome
K-5, a Soviet November-class SSN, the threat that made Western conventional SSKs obsolete
USS Thresher, the first high-speed deep-diving SSN optimized for both ASW and surface attack
The Russian navy is the naval arm of the Russian Armed Forces. It has existed in various forms since 1696; its present iteration was formed in January 1992 when it succeeded the Navy of the Commonwealth of Independent States.
The Russian Admiralty in St. Petersburg is famed for its gilded steeple topped by a golden weather-vane in the shape of a sailing ship.
Slava-class cruiser Moskva, sunk in the Russian invasion of Ukraine
A Naval Spetsnaz frogman
Oscar II class cruise missile submarine Tomsk
