Pinger locator used to find the Malaysia Airlines black box
4 April 2014 Last updated at 11:55 BST
Search teams have begun using a towed pinger locator to hunt for the black box of missing Malaysia Airlines flight MH370.
The plane disappeared on 8 March en route from Kuala Lumpur to Beijing. It was carrying 239 people.
Transport Correspondent Richard Westcott reports on the technology being used to try and solve the mystery in one of the most inhospitable places on earth.