Last updated: September 17, 2017 at 21:52 pm
K-222 (K-162) Papa class nuclear-powered submarine (Soviet Union), commissioned in December 1969. Reported maximum speed: 44.7 knots (82.2 kph / 52 mph). Maximum operational depth: 400 m (1,312 ft). Only one was ever built. The Alpha class nuclear-powered submarine (Russia) has a reported maximum speed of 40 knots (74 kph / 46 mph) Maximum operational depth: 760 m (2,500 ft). The fastest U.S. submarine, the USS Seawolf (SSN-21), is believed to reach up to 35 knots. Electric boat is reportedly working on an underwater craft capable of transporting Navy Seals at speeds up to 100 knots (185 kph / 115 mph) using supercavitation. The K-222 was deleted from the Soviet Red Banner Northern Fleet list in 1989 and scrapped in 2010.