Deepwater Horizon supply vessel was alongside Deepwater Horizon at time of blast . Landry said the first sign of trouble was when drilling `` mud '' -- a mixture used to pressurize and lubricate the drills -- began falling onto the stern of his ship . ` Landry said first sign of trouble was when drilling `` mud '' began falling onto his ship . Captain radioed rig 's bridge and was warned he should move his ship away . Rig sank two days , two days after explosion ; one presumed dead ; oil still gushing into the Gulf of Mexico .
Deepwater Horizon supply vessel was alongside Deepwater Horizon at time of blast . Landry said first sign of trouble was when drilling `` mud '' began falling onto his ship . Captain radioed rig 's bridge and was warned he should move his ship away . Rig sank two days , two days after explosion ; one presumed dead ; oil still gushing into the Gulf of Mexico .