Warpdrive Underwater

Scientific American reports that we may be on the verge of a new generation of marine warfare in which "supercavitating systems could alter the nature of undersea warfare, changing stealthy cat-and-mouse stalking contests between large submarines into something resembling aerial combat, featuring noisy high-speed dogfights among small, short-range "subfighters" shooting underwater bullets at one another after having been launched from giant 'subcarriers'." Just when you thought it was safe to go back in the water.