Tests showed unstable cement in gulf oil well before explosion
• Washington PostA cement mixture intended to temporarily seal BP's Macondo exploration well repeatedly failed lab tests before the April 20 blowout, a presidential commission investigating the oil spill said Thursday.
http://www.iol.co.za/news/world/tests-warned-of-cement-troubles-before-blowout-1.689762
http://www.sfgate.com/cgi-bin/article.cgi?f=/n/a/2010/10/28/national/w103400D67.DTL