SSK was the United States Navy hull classification symbol for a diesel-electric submarine specialized for anti-submarine duties. SS indicated that the vessel was a submarine, and the K suffix that it was a hunter-killer. The United States Navy does not currently operate any submarines of this type, and so the designation is inactive.
The start of the Cold War in the mid-1940s and the threat of Soviet submarines in the Atlantic led several Western navies to build or adapt submarines to specialize in hunting other submarines. The changes included streamlining to make them quieter and improved acoustic sensors. This type of vessel was given the classification SSK in United States service. The changes were eventually incorporated into all submarines, allowing the SSK role to be subsumed into the regular attack submarine role and the classification became obsolete.
The only purpose-built ones were the three Barracuda-class:
These were small submarines equipped with enhanced hydrophones and designed to lie in wait for Soviet submarines off the Russian coast. They were designed to be cheaply built for easy mass-production in the event of a war, and were all reclassified as SS or SST boats in 1959 when they were relegated to training duties.
- USS Grouper (SSK-214)
- USS Angler (SSK-240)
- USS Bashaw (SSK-241)
- USS Bluegill (SSK-242)
- USS Bream (SSK-243)
- USS Cavalla (SSK-244)
- USS Croaker (SSK-246)
The term SSK term is sometimes currently used to indicate a diesel-electric patrol submarine.
- United States Navy. "Inactive Classification Symbols". Naval Vessel Register. http://www.nvr.navy.mil/oldclass.htm.
- For example in "SSK Kilo Class (Type 636) Attack Submarine, Russia". SPG Media Limited. http://www.janes.com/news/defence/jni/jni100920_1_n.shtml. and Ted Parsons (20 September 2010). "Mystery Chinese SSK fuels Asia's submarine race". IHS Global Limited. http://www.naval-technology.com/projects/kilo/.
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