Photo: Planes to Shoot Lasers to "Talk" to Submarines?



Lasers that can create loud bangs under the sea might someday replace sonar for sending messages to submarines (pictured), Navy physicists announced in May 2009.

The self-focusing beams heat tiny amounts of water in the sea to create "little pistons of steam" that expand at supersonic speeds.

Photograph courtesy Commander Submarine Group 9, U.S. Navy


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