ghostswimmer
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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. It goes as deep as 300 feet, and it can operate autonomously for long enough that the Navy doesn't have to stay nearby to keep watch.
