Ian Urbina, of The New York Times, reports that a BP document provide to the paper by a Congressional investigator reveals that BP officials chose "to use a type of casing for the well that the company knew was the riskier of two options." The selected casing only had a single seal, and if cement did not properly set it could create an leak from the wellhead. "The approach taken by the company was described as the 'best economic case' in the BP document. However, it also carried risks beyond the potential gas leaks, including the possibility that more work would be needed or that there would be delays, the document said. "
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