Hunting for missing MH370 continues (4/6)

Photo provided by Australian Department of Defense shows the Australian vessel "Ocean Shield" conducting search operations for the missing Malaysia Airlines flight MH370 on April 4, 2014. The search leader hunting for missing Malaysian flight MH370 said on Tuesday that no submersible onboard the Australian vessel "Ocean Shield" would be deployed unless the ship detects more credible signal. (Xinhua)