I've been on enough wellsites to know how little the guys on location know about what is really happening. I doubt it's any different on an off-shore rig.
"Concrete"... yeah, right. That article contradicts itself a bit when it talks about cementing (concreting?) a casing string and then quotes the old drilling engineer that seems to be talking about an abandonment plug.
There's not much reliable technical information on what actually happened and with the potential legal liabilities, I doubt much will ever come out.
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