SHARC.

This is coolbert:

Is it an iceberg or is it Moby Dick?

Thanks to Forbes and tip from Marcus.

"Mystery Unmanned Craft Seen Off Florida May Be Secret SHARC Spy Vessel"

"A ‘what is this?’ Facebook video from FishMonster, picked up by HI Sutton on his Covert Shores site, shows a curious vehicle spotted off Florida’s Key West last week. Virtually the only part of it above water is a mast supporting an array of antennae.  The vehicle is almost certainly a Wave Glider made by U.S. company Liquid Robotics (now owned by Boeing BA) , and the antennae suggest it is part of a U.S. Navy development known as Sensor Hosting Autonomous Remote Craft, or SHARC."

This is what is seen at the surface. Antenna array and apparently a solar charging panel of some sort.

This is what is below the surface. The vessel a "spy" submersible it is called. I am not sure if that towed array as seen at the surface can be raised or lowered at will.

Get em' SHARC. 

A very good idea. 

 coolbert.