Inquiry: BP, Halliburton knew well cement was 'unstable'

None of the revelations in this following news story surprise me. I’ve said it before (column link below) 

“Deepwater Horizon disaster was no accident - it was a certainty”

BP and Transocean, another partner, 'misinterpreted or chose not to conduct' key tests, inquiry reveals

Excerpt:

“BP and its cement contractor, Halliburton, knew weeks before the Deepwater Horizon explosion that the cement mixture they planned to use to seal the new well was unstable but still completed the work, staff for the presidential commission investigating the accident said in a letter Thursday.”