Photo credit: DARPAMore

From Popular Mechanics

DARPA is embarking on an undersea submarine detection system so weird it may just work. The Pentagon’s research and development arm wants to learn the behaviors of undersea animals including fish, shrimp, and microscopic phytoplankton so it can use them to detect manned and unmanned submarines passing by. Such a network would enhance the U.S. military’s ability to detect even the quietest submarines.

Traditionally there are two methods to detect submarines at sea: active and passive sonar. Active sonar broadcasts pulses of sound into the water. When the pulses bounce back to the sender, they can

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