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Russia:
Project 661 Anchar (NATO Papa) class, K-222, in dry dock at Severodvinsk, 2008.
K-222 was the world's fastest submarine reaching a record submerged speed of 44.7 knots (82.8 km/h; 51.4 mph). However, K-222's high speed came at the price of high costs during construction, and both excessive noise and significant damage to external hull features when used.
Project 661 Anchar (NATO Papa) class, K-222, in dry dock at Severodvinsk, 2008.
K-222 was the world's fastest submarine reaching a record submerged speed of 44.7 knots (82.8 km/h; 51.4 mph). However, K-222's high speed came at the price of high costs during construction, and both excessive noise and significant damage to external hull features when used.