Super-stealth sub powered by fuel cell

[Forkboy]

Eckernfoerde, Germany (CNN) -- It is almost totally silent, radiates virtually no heat and is constructed entirely from non-magnetic metals.

Meet the U212A -- an ultra-advanced non-nuclear sub developed by German naval shipyard Howaldtswerke Deutsche Werft, who claim it to be "the peak of German submarine technology."

And few would argue. The super-stealth vessel is the first of its kind to be powered by a revolutionary hydrogen fuel cell that lets it cruise the deep blue without giving off noise or exhaust heat.

That's important, because according to Bernd Arjes, a captain in the German Navy, silence keeps submariners alive.

http://edition.cnn.com/2011/TECH/innovation/02/22/hybrid.submarine/

Neat video at the link. :)