WORLD  ·   December 27, 2013

Surveillance network picks up surprising sounds

- The U.N. has sensitive undersea acoustic monitors set up to detect illegal nuclear activity, but they pick up all sorts of other sounds as well. Ranging from whales to earthquakes, the network is full of surprises. ()

- The U.N. has sensitive undersea acoustic monitors set up to detect illegal nuclear activity, but they pick up all sorts of other sounds as well. Ranging from whales to earthquakes, the network is full of surprises. ()

Surveillance network picks up surprising sounds (1:45)

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