BBC: Eleven people died when an explosion destroyed the Deepwater Horizon drilling rig on 20 April. Owned and operated by Transocean, the rig had been working on behalf of BP at a well site 48 miles (77km) off Louisiana. Thousands of barrels of oil have been gushing daily into the sea from the well’s ruptured riser pipe, nearly a mile below the surface. BP is using underwater robots in its latest attempt to stop the leak, which involves jamming a tube into the pipe to siphon …