[Spotted in Don Park's Daily Habit>http://www.docuverse.com/blog/donpark/2003/11/22.html#a1033]. I remember reading about this stuff ages ago. I seem to remember the big problem with it was that you couldn't turn it. They made Supercavitation bullets and Supercavitation torpedos, because you don't have to turn it as it shoots, it goes in a straight line. Now, a submarine needs to turn, dive, rise, etc, which as far as I know, still hasn't been solved for Supercavitation under the water.