There was NO BP Drilling Crew

Transocean own and operate the rigs they provide the crew

Were they running casing at the time then a specialist casing sub-contractor would put a crew out to do that job, once the casing is set they then turn the drill floor back to the Transocean Crew who would then drill the well.

Was BP to blame, I have no idea, based on what I have read so far, it would not surprise me if they are somewhat in part to blame. Are they responsible? undoubtedly. You are talking about operations right at the leading edge of the technology currently available in this depth of water and at this depth of well they are pioneering.

Something like being a passenger in a taxi and you are in a hurry. You instruct the taxi driver to run a red light, or urge him to go faster or overtake. If there is an accident, a collision, you as the passenger would not be charged, the taxi driver would as he should have exercised better judgement as he was in charge of the car.

Could BP fire Transocean, yes of course they could but it would be highly unlikely as it would have cost them too much in terms of time and money. As stated above there are not that many rigs that can drill in this depth of water.

Nobody complained about BP when they discovered the latest "Elephant" in deep water in Gulf Of Mexico a few months ago, no talk of incompetence then. The discovery of that field will radically alter oil imports for the US