The world’s fastest submarine, the Soviet K-162 “Anchar”, reached a world record speed of 44.7 knots (82.8 km/h) during test trials in the 1970’s. Built to be a super-fast attack sub, the titanium hulled Anchar carried the NATO distinction of “Papa” class. Regarded as the predecessor to the more widely known “Alpha” class, the Anchar served the Soviet navy at the height of the Cold War and holds speed records up to today.