Underwater speed record

Established reports and manufacturer's claims indicate that a handful of submarines are capable of speeds exceeding 30 knots (56 km/h; 35 mph).

[3] In response the United States Navy developed the Los Angeles-class submarine, with a reported speed of 30–32 knots (56–59 km/h; 35–37 mph).

[4][5] There are also claims that the Soviet twin-propeller submarine K-222, with titanium inner and outer hulls, reached 44.7 knots (83 km/h; 51 mph), fully submerged, during sea trials in 1969.

The British Spearfish torpedo, designed to counter high-speed Russian submarines such as the Alfa class, is reputed to reach speeds in excess of 70 knots (130 km/h; 81 mph).

[6] The German press reported on an underwater anti-torpedo missile, formerly named Barracuda, allegedly capable of reaching 430 knots (800 km/h).

The USS Albacore , with its teardrop hull , is claimed to have reached an underwater speed of 33 knots (61 km/h; 38 mph).