http://www.huffingtonpost.com/2010/05/20/bp-smoking-gun-oil-giant_n_583590.htmlA spokesman for the testing firm, Schlumberger, said BP had a Schlumberger team and equipment for sending acoustic testing lines down the well "on standby" from April 18 to April 20. But BP never asked the Schlumberger crew to perform the acoustic test and sent its members back to Louisiana on a regularly scheduled helicopter flight at 11 a.m., Schlumberger spokesman Stephen T. Harris said.
At a few minutes before 10 p.m., a belch of natural gas shot out of the well, up a riser pipe to the rig above, igniting massive explosions, killing 11 crewmembers and sending millions of gallons of crude oil into the Gulf. The rig's owner, Transocean, blames failed cement seals, installed by Halliburton, for the disastrous blowout.
At a few minutes before 10 p.m., a belch of natural gas shot out of the well, up a riser pipe to the rig above, igniting massive explosions, killing 11 crewmembers and sending millions of gallons of crude oil into the Gulf. The rig's owner, Transocean, blames failed cement seals, installed by Halliburton, for the disastrous blowout.
If I recall, the original rumor was that Schlumberger's test team had to hire a private helicopter as there were no scheduled flights.
This official statement pretty much puts the full blame right at BP's feet.
Edit to fix div.