Sonar

The Navy's Bluefin 21 has covered more than 80 percent of the search area in the effort to find out what happened to Malaysian Airlines flight 370. (Australia Department of Defence via Getty Images)

Australia Signals Deeper Search For Malaysian Jet

The Navy’s Bluefin 21 has covered more than 80 percent of the search area.

04/22/2014

File photo of a dead dolphin. (credit: WILFREDO SANDOVAL/AFP/Getty Images)

Navy: Hundreds Of Dolphins, Whales Will Die During Bomb Testing

The US Navy acknowledged Friday that because of bomb testing and heavy sonar activity hundreds of marine mammals and will be killed and injured.

09/03/2013

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