Underwater speed record
In 1968 there was an incident when a Soviet tracked an American carrier group traveling at . This led the United States Navy to develop the s, whose reported speed is . There are established reports and manufacturer's claims that would indicate two (or perhaps more) submarines are capable of speeds exceeding . In 1965, reported a speed of , but this was not an official record. The (Russian: "shark")-class vessel is reportedly capable of travelling submerged at , its predecessor, the , could attain short speed bursts of while submerged. There are claims that the Russian titanium submarine "K-162" reached on  sea trials, fully submerged, in 1969. However, due to the rather secretive nature of these vessels, confirmations of these numbers are not present. The British Spearfish torpedo designed to counter high-speed Russian submarines, such as the "Alfa"-class submarine, is reputed to have a speed in excess of . The Russian rocket-powered supercavitating torpedo VA-111 Shkval is reportedly capable of speed in excess of . German press reports of an underwater anti-torpedo missile named Barracuda that allegedly reaches . The United States Navy has contracted with the General Dynamics Electric Boat Division to support development of the Underwater Express, an undersea  transport capable of controllable speeds up to through supercavitation. The Swordfish is the fastest sea animal with a recorded speed of 97 km/h (60 mph). See Fastest animals.