There are established reports and manufacturer's claims that would indicate two (or perhaps more) submarines are capable of speeds exceeding 30 knots. In 1965 the USS Albacore reported a speed of 33 knots (61 km/h or 38 mph) but this was not an official record. The Akula-classsubmarine (Russian: shark) class vessel is reportedly capable of travelling submerged at 35 knots (65 km/h or 40 mph), its predecessor, the Alfa class submarine, could attain short speed bursts of 40-45 knots while submerged. There are claims that the Russian titanium submarine K-162 reached 44.7 knot on 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 70 knots (130 km/h or 80 mph). The Russian rocket-powered supercavitating torpedo VA-111 Shkval is reportedly capable of speed in excess of 200 knots (370 km/h or 230 mph).German press reports of an underwater anti-torpedo missile named Barracuda that allegedly reaches 800 km/h. The U.S. 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 100 knots (185 km/h) through supercavitation.