April 30, 2010 7:33 PM

Cement job at underwater well probed as possible cause

Officials haven't said what they think caused the April 20 explosion that led to the sinking two days later of the Deepwater Horizon drilling rig, owned by Transocean Ltd. But industry speculation points to a process where cement is used to seal cracks in the ocean floor surrounding the tubing through which crude oil flows.

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