AP at its level best.

From the article;
Based on the interviews with rig workers, none of those safeguards worked.

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Associated Press writers Cain Burdeau, Vicki Smith and Ray Henry in Louisiana, Jeff Donn in Boston, Michael Graczyk in Houston and Noaki Schwartz in Los Angeles contributed to this report.

Apparently these AP writers aint smart enough to figger it out that the safeguards didn't work.