On board ship hunting Malaysia Airlines flight MH370

This weekend will mark a year since the Malaysia Airlines flight MH370 disappeared soon after take off on route from Kuala Lumpar to Beijing.

There were 239 people on board. Twelve months on, the plane's fate remains one of the world's great mysteries.

The underwater search is focused in an area of the southern Indian Ocean around 1,800km (1,118 miles) off the coast of western Australia.

BBC correspondent Jon Donnison has been given rare access to one of the search ships and reports from Perth.