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Navy Prepares Bluefin-21 Sub for MH370 Search

The hunt for the missing Malaysia Airlines Flight MH370 continued with underwater searches by US Navy submersible vessel Bluefin-21. The unmanned vessel began its fifth sweep of the seabed in the search zone on April 18. This video shows maintenance being carried out on the vehicle on board the Australian Defence Vessel Ocean Shield on April 11. Credit: US Seventh Fleet