The World's Fastest - Why Nothing Can Stop Soviet Submarines

via Military Update
Speed has often held a mixed appeal in submarine warfare. After all, even very quiet submarines become noisy when they're tearing through the ocean at their maximum speed of 20 to 30 knots. As typically the goal in submarine warfare is to detect an unaware adversary and launch torpedoes without being detected in return, many submarines cruise at little more than a brisk jog to minimize noise.