clipped from: www.networkworld.com 
This sounds like something straight out of a James Bond movie but no, it's real and it's your government: Those way out engineers at the Defense Advanced Research Projects Agency (DARPA) want to build an aircraft that's as capable of zipping through the sky as it is underwater.
Interestingly there was a patent issued in 2007 to Gennady Ploshkin, for a disc-shaped aircraft that could take off like a helicopter and submerge like a sub. There have been other sub-plane designs as well. Probably the most famous flying sub was in the TV show Voyage to the Bottom of the Sea.
