The second I believe was from another point in the kinked and mangled fallen pipe, still connected to the wellhead at the seabottom.
The cementing may, I say MAY, have been the source of the original blowout that started the chain of events.
The Blowout Preventer (strong valve capable of shearing through the drillstem pipe) has not operated either originally, nor when the submersible ROV’s (robot submarines) have gone to the main control panel and manually operated it.
Multiple things have gone wrong to get to this point.
The blowout should not have happened.
The gas from the blowout should not have ignited.
The BOP should have shut off the well automatically.
The BOP should have been triggered after the blowout occurred.
The BOP should have been capable of being closed manually from the ROV after the rig sank.
That is just the highlights.
How could so many things go wrong at one time? What would be the statistical odds?
My nephew majored in actuarial science, if we can find the information on the various failure rates of each of those factors, I might be able to get him to do the calculations for us. I guess he would need both the failure rates and the days of use. It just raises so many questions in my mind.