From The Next Big Future:
From 2007, seapower digital has more information on the Underwater Express program. Underwater express is a DARPA project looking to create a 100 knot (110 mph) submarine that is 8 feet in diameter and 60 feet long and would not have a surface signature. It would replace a 40 knot speedboat for special forces. It would probably have a thermal power source (maybe a nuclear engine or a diesel engine) that would power water jets. A speedboat also makes a lot of noise so sonar/sound detection would not be different, but an underwater delivery would have nothing to spot on the surface and would be over twice as fast. There is the challenge of detecting obstacles and controlling the supercavitating craft when surrounded by an air pocket when sonar and sensors are useless.
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