How deep underwater missing plane MH370 could be

Teams searching for the missing plane MH370 are to use a special robotic submarine to search areas of the bottom of the Southern Indian Ocean.

They've so far been searching for the plane's 'black box', using a 'pinger' to detect a signal deep underwater.

They thought they might have found one last week, but have heard nothing since. The big problem they face is just how deep the black box is likely to be. This picture shows just how far down rescuers think it is.

The depth of the search

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