[Romulus]

Seems like sabotage to me. i.e., an inside job.

An offshore drilling rig is a pretty highly controlled environment. Care to speculate how a saboteur is going to get on board, get an explosive device down the hole, and then trigger it, with no one noticing or challenging him? Don't you think BP keeps logs of who comes and goes on the drilling deck? Let's not get hysterical here. This is an industrial accident.

[She hits a grand slam tonight]

You don’t think a good swimming SCUBA diver could do such an act?

[your local physicist]

I agree; sabotage is extremely unlikely in this accident. One or more of three things happened here:
1) An error in the design or manufacturing of the drilling equipment.
2) An error in the operation of the drilling equipment.
3) Some kind of completely unexpected event occurred, such as pressures on the oil pipe and equipment that were well above any pressures ever seen in offshore drilling and above the pressures this equipment could tolerate.

If I had to take a shot at it, I'd say item 2 is the most likely cause of this accident. Somebody probably made a serious mistake in operating the equipment on the rig. Defective equipment and an unexpected event are also possible causes, perhaps combined with errors in equipment operation. Sabotage is about the least likely cause. I can't think of who would gain from sabotage other than environmental groups, and they don't have the ability to sabotage a deepwater oil rig.

[Rutles4Ever]

We’ll see. I can’t wait to hear the post mortem.