Scott Bronstein and Wayne Drash
Program Note: On "AC360°," five survivors of the rig tell Anderson Cooper about the days leading up to the explosion. Watch "AC360°" at 10 ET Tuesday night, live from the Gulf.
(CNN) - The morning the Deepwater Horizon oil rig exploded, a BP executive and a Transocean official argued over how to proceed with the drilling, rig survivors told CNN's Anderson Cooper in an exclusive interview.
The survivors' account paints perhaps the most detailed picture yet of what happened on the deepwater rig - and the possible causes of the April 20 explosion.
The BP official wanted workers to replace heavy mud, used to keep the well's pressure down, with lighter seawater to help speed a process that was costing an estimated $750,000 a day and was already running five weeks late, rig survivors told CNN.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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