UAV With Underwater Capacity

"Flying Drone Can Hide Underwater For Months Like a Nuclear Submarine". 

A submarine’s periscope is a useful reconnaissance tool, but it puts the vessel at risk since it can only be used when the sub surfaces. As an alternative, researchers at Johns Hopkins University have created a waterproof drone that can float up from the murky depths and then take to the skies to provide an aerial view.

Named the CRACUNS (Corrosion Resistant Aerial Covert Unmanned Nautical System) the waterproof drone could be mounted to the outside of a submarine and only deployed as needed for additional intelligence gathering—without putting the billion dollar vessel at risk.

Somebody worked pretty hard to make the acronym work.  (Via H.R.)