A new autonomous underwater vehicle created by engineers at the Massachusetts Institute of Technology is able to hover over a specific position in the ocean even in the face of currents.
How'd they do it? In a word: thrusters.
The Odyssey IV, which was developed at the MIT Sea Grant Program's Autonomous Underwater Vehicles Laboratory, uses a combination of fins and thrusters on both ends of the robot. It allows it to act more like a helicopter than a propelled glider. The thrusters can also propel the Odyssey IV as fast as two meters per second.