BP was told of oil safety fault 'weeks before blast'
A Deepwater Horizon rig worker has told the BBC that he identified a leak in the oil rig's safety equipment weeks before the explosion.
Tyrone Benton said the leak was not fixed at the time, but that instead the faulty device was shut down and a second one relied on.
Hilary Andersson reports.
Panorama: BP - In Deep Water, BBC One, Monday, 21 June at 8.30BST.