Transocean’s semi-submersible drilling vessel Deepwater Horizon was finishing work on a wellbore that had found oil 18,000 feet beneath the seafloor, in mile-deep water fifty miles off the Louisiana coast. Supervisors in the control cabin overlooking the drilling operations area were directing routine procedures to cement, plug and seal the borehole, replace heavy drilling fluids with seawater and extract the drill stem and bit through the riser (outer containment pipe) that connected the vessel to the blowout preventer (BOP) on the seafloor.
Suddenly, a thump and hiss were followed by a towering eruption of seawater, drilling mud, cement, oil and natural...











Lessons From the Gulf Blowout
The waivers were granted despite President Barack Obama’s vow that his administration would launch a “relentless response effort” to stop the leak and prevent more damage to the gulf. One of them was dated Friday — the day after Interior Secretary Ken Salazar said he was temporarily halting offshore drilling
“Is there a moratorium on off shore drilling or not?” asked Peter Galvin, conservation director with the Center for Biological Diversity, the environmental group that...