A worker on the Deepwater Horizon tells Panorama's Hilary Andersson that a key part of the rig's spill prevention equipment was broken weeks before the rig exploded.

Tyrone Benton, who is now suing BP and Transocean, said both were informed of the leak in the safety device. BP's Tony Hayward has told Congress that he has seen no evidence that safety was compromised in order to save money.

Panorama: BP - In Deep Water, BBC One, Monday, 21 June at 8.30BST.