Ok, so they drill site A and it either blew out -"they almost blew up the rig" or created a situation that required a shut down. So, in that situation where they abandon the well or that it blew out but the rig was saved -Did they lose the pipe between the rig and the BOP with a emergency detach? Is site A what we see now? Where we saw a cut riser and an intact BOP. And the real problem is where the deep horizon was drilling Site B - either a relief well for site A or another failed attempt to access one of the richest oil/gas fields on this planet resulting in a blowout of both wells? Quoting: ByndPhkd
Forget site A & B for a second.
They were drilling in the seafloor, trying to go to fast and got stuck (never reached oil but there is always gas). They were stuck bad and had to sever the drill pipe around March 10. Then they had to start repairing the area they drilled and drill a different route.
This was all reported to the MMS.
They were fighting with the repairs the whole time but wanted the oil. The cement wasn't repairing the well cracks like it should have and many times they would have to use different substances the try to plug the holes.
Transocean said BP was in the process abandoning the rig when it blew, and that may be possible. They may have been pulling up the drill when the the gas escaped and blew the rig, but it seems like others on the rig would have reported that fact.
Personally I think they were still going after the oil and lost control of the gas escaping the well.