Navy drone swims like a shark to spy on foes

It’s hard to covertly gather intelligence on the open seas; conventional drones and submarines make it rather obvious that something’s up. The US Navy might just have a stealthier option with its experimental GhostSwimmer drone, which recently finished tests. The five-foot-long robot looks and swims much like a shark, letting it spy on enemies (or inspect friendly ships) without being conspicuous – as long as curious foes don’t get too close, anyway.

Robot sharks. Our tax dollars hard at work.