Navy Drones Take to the Sea

The Navy is seeking a way to do underwater what the Air Force has been doing in the sky: prowl stealthily for long periods of time and gather the kind of data that could turn the tide in war. But in a new twist, the Navy has found a way to power an eventual fleet of 150 submersible drones from the ocean itself, increasing deployment times and cutting fuel costs.

The drone, known as the Slocum Glider, changes density in response to the outside water, causing the 5-ft.-long (1.5 m) torpedo-like vessel to rise or sink through the ocean's thermoclines, or...

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