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Posted by Rich Weaver on March 13, 2010 at 12:53pm

I've found this interesting article in IEEE Spectrum this month. Interesting method of propulsion which isn't addressed in the slide show.

http://spectrum.ieee.org/slideshow/energy/environment/underwater-glider-arrives-in-spain

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Bill Porter March 13, 2010 at 4:10pm

UUV gliders have been around for a while, and have already made trips across oceans. I know of one that crossed the Atlantic.

There are also 'Wave Gliders' that harvest energy from waves to propel themselves. One went from Hawaii to California.
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Chris Anderson March 13, 2010 at 2:52pm

For those who don't want to click through, this is just the underwater kind. They've been called gliders for a decade or more--this is pretty standard stuff these days in AUVs. The method is just changing buoyancy and letting the shape of the craft turn vertical motion into forward motion.

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