Fifty miles offshore, a mile underwater on the seafloor, BP's Macondo well was spewing something like an Exxon Valdez every four days. In late April an explosive blowout of the well had turned the ...

Cement used to seal the Macondo well may have contributed to the blowout that caused the Gulf of Mexico oil spill, US investigators have found. Both BP, which owned the well, and Halliburton ...