The ship Ocean Shield is pictured at Her Majesty's Australian Ship (HMAS) Base Stirling, south of Perth, May 10, 2014. The Australian naval vessel carrying the Bluefin-21 submersible underwater drone ... more 
The ship Ocean Shield is pictured at Her Majesty's Australian Ship (HMAS) Base Stirling, south of Perth, May 10, 2014. The Australian naval vessel carrying the Bluefin-21 submersible underwater drone involved in the search for missing Malaysia Airlines Flight MH370 left port on Saturday on its second mission to scan part of the Indian Ocean floor off Western Australia, where the longest sonar "ping" was heard over a month ago. REUTERS/Morag MacKinnon (AUSTRALIA - Tags: MILITARY DISASTER MARITIME TRANSPORT) less 
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Reuters | Photo By STRINGER / REUTERS
Sat, May 10, 2014 8:45 AM EDT