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Black box data would last 30 days on the ocean floor

11 March 2014 Last updated at 03:59 GMT

Rescue teams from nine countries will now scour areas stretching from the Malacca Strait to the South China Sea to search for the missing Malaysian Airlines plane.

Former commercial airline pilot Alex Hidveghy who worked for several years as a contract pilot for the cargo division of Malaysian airlines told BBC News the "black box data would last 30 days on the ocean floor".