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SUB ~ At more than $4 billion apiece, Seawolf Class submarines were the most expensive in history. But they were designed for a mission that brooked no failure; stalk and destroy Soviet ballistic missile subs before they could launch their weapons. Designed to be extremely fast and extremely quiet, the high price tag and diminished Soviet submarine threat with the end of the cold war caused the program to be cancelled after the first three boats were delivered.~ BFD

HMS Seawolf (N 47) of the Royal Navy - British Submarine of the S class - Allied Warships of WWII - uboat.net

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from Telegraph.co.uk

Deep Siren messaging system helps submarines communicate under the ice

US Navy safety swimmers stand on the deck of the Virginia class submarine USS New Hampshire after it surfaced through thin ice during exercises underneath ice, in the Arctic Ocean north of Prudhoe Bay, Alaska March 19, 2011

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SUB ~ PACIFIC OCEAN (Nov. 17, 2009) The Seawolf-class attack submarine USS Connecticut (SSN 22) is underway in the Pacific Ocean. Ships from the U.S. Navy and Japan Maritime Self-Defense Force are participating in Annual Exercise (ANNUALEX 21G), a bilateral exercise designed to enhance the capabilities of both naval forces.~ BFD