End in sight for oil spill?, MSNBC, July 12, 2010:
Oil and gas industry expert Bob Cavnar:
I'm real concerned about this shut in integrity test they're going to plan in the morning, because of the down hole damage that we've talked about for the last several weeks, plus there are some components in that blowout preventer stack, the flex joint below this new assembly that doesn't rate the pressure I'm worried about it's going to take to shut it in. ...
[R]emember, on Memorial Day, we had the issue of shutting down the top kill in the middle of the procedure. And it shut down so quickly that there was a challenge, they thought, with down hole problem, where there was a casing failure or possible subsurface valve failure that caused them to shut it down. So, that left the casing weak, where shutting the well in could cause it to blowout underground.