Media playback is unsupported on your device

Malaysia Airlines flight MH370: Giant sub drafted in to find plane

28 April 2014 Last updated at 23:11 BST

As the search for Malaysia Airlines flight MH370 draws a blank, the BBC's Richard Westcott reports on the kind of technology that is being drafted in to help step up the investigation.

It includes an auto-sub to map the ocean floor, which can dive 1.5km deeper than any submarine used before.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.