Unmanned gliders are using only the thermal power of the sea to carry on tasks that last months. Sounds a bit like science fiction, but rest assured, it’s real.

A joint team from the University of the Virgin Islands and the Woods Hole Oceanographic Institution launched an underwater vehicle in December of 2007. Uninterrupted all this time, it has traversed along the Virgin Island Basin 20 times, sometimes at depths reaching 2.5 miles deep.

Unlike conventional gliders that rely on batteries and pumps, the thermal glider responds to the differentials in ocean temperature. Tubes made of wax expand into mechanical energy, causing the craft to go buoyant. Those tubes later cool at depths, starting the cycle all over again.

The team has a working prototype that will be able to propel itself with unlimited green energy. They plan to use the design for missions that will take upwards of six months. They are agile, unmanned and can be set to do tasks such as gather salinity, topography, monitor biological activity and acoustic readings.

Everyone on the team is eager to launch more of the crafts in the North Atlantic. Data from the region will shed more light on the response the ocean has had to climate change.

You may just want to keep your eye out for one on your next SCUBA trip to Bermuda. Smile and nod, just don’t try to out swim it.

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