LG it is a recording of Mark Levin interviewing an engineer who was purported to have been on board when things went to h*ll!
What he said is essentially that they had circulated all of the weight material out of the riser with sea water and tested the BOP in anticipation of pulling off of the well. When the annular rams were reopened after that test everything went to hell very quickly! Given what we already know that just confirms our earlier speculation.