The US isn't just worried about terrorist bombings above-ground -- it's concerned about bombs below the waves, too. To that end, it's working with Saab on a remotely-controlled underwater robot, the Sea Wasp, that's designed to deal with improvised explosives. The machine (a smaller take on the existing Seaeye) uses a mix of sonar and a manipulator arm to find, move and sometimes disable explosives. Its party trick is its sheer maneuverability. It can hover in virtually any position, helping it dispose of bombs even when they're attached to a ship's hull.