Those weapons (torpedo's) pose little threat to SES (Surface Effect Ships) and are designed to destroy conventional displacement craft.
Look at all the latest Corvettes and Fast Attack Craft - all very stealthy. You have to find them (see them) first before you can kill them.
Here is the look of the future Navy - well according to some.
http://www.knmskjold.org/logg2003/englog2003.htm
More info:
http://www.safetycenter.navy.mil/media/fathom/issues/JanMar03/isskjold.htm
Quote:
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More evolutionary than revolutionary, the 3-year-old ship is the prototype for six such fast patrol boats (FPBs) to be built in Norway. All incorporate multinational technology. The ship is not an experimental craft because she was designed and built to meet specific requirements. Using a catamaran (twin-hull) design, Skjold is a rigid-sidewall surface effect ship (SES) that can sustain 50-plus knots and can operate in waters as shallow as 3 feet. With its light weight and two lift fans for SES operation, Skjold can lift about 70 percent of her weight out of the water, yet keep some "keel" in the water via her two hulls. The ship's high-speed capability could not be achieved with a traditional hull or catamaran design and without the lift fans. Having a minimum portion of the hull in the water reduces "skin drag:" friction created by the portion of a hull beneath the water's surface as a ship moves forward (or backward). Reduced skin drag thus allows for higher speeds.
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