The rig was drilling oil for the energy giant BP. Eleven crew members are still missing and presumed dead. Newly disclosed documents, meanwhile, show BP heavily lobbied against stricter offshore drilling safety rules when they were being considered last year. In September, BP wrote the US Minerals Management Service that additional safety regulation was unnecessary to replace existing voluntary standards. On Tuesday, Democratic Congress members Henry Waxman of California and Bart Stupak of Michigan asked BP to explain what they knew about safety risks at the drilling site before the explosion took place. In a letter to BP, Waxman and Stupak also expressed concern BP is attempting to manage the spill “with techniques that have never been used before at these ocean depths.”