Akula class (submarine)

Akula-class attack sub is Russian submarine class, it used Shkval, an experimental torpedo developed by the Russians in the late seventies, and improved upon since, could reach a top speed of 100 meters per second, while an ordinary torpedo could travel at best 130 kilometers per hour; it operated on the principle of supercavitation, which reduced hydrodynamic drag by enclosing the torpedo within a self-generated bubble of water vapor and gas.

In February 7 1994 Serbian forces used submarine of this class to confront Khan Noonien Singh super sub SGK Kaur. It only succeed to damage Khan super sub with one Shkval torpedo before is destroyed. (TOS novel: The Rise and Fall of Khan Noonien Singh, Volume 2)