This undated photo provided by the U.S. Army shows a test pond 

This undated photo provided by the U.S. Army shows a test pond at Aberdeen Proving Ground in Aberdeen, Md. Two Navy divers with the Mobile Diving and Salvage Unit died Tuesday, Feb. 25, 2013 during a routine training operation in the pond. An Aberdeen spokesman says that the deaths are not believed to be connected to a death late last month at the site, when an engineering technician died while performing maintenance. The pond is used for a variety of tests, including shock testing of boat hulls. (AP Photo/U.S. Army\)
Associated Press
This undated photo provided by the U.S. Army shows a test pond at Aberdeen Proving Ground in Aberdeen, Md. Two Navy divers with the Mobile Diving and Salvage Unit died Tuesday, Feb. 25, 2013 during a routine training operation in the pond. An Aberdeen spokesman says that the deaths are not believed to be connected to a death late last month at the site, when an engineering technician died while performing maintenance. The pond is used for a variety of tests, including shock testing of boat hulls. (AP Photo/U.S. Army\)
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