Newly disclosed records show at least three of the wells linked to the offshore rig that exploded in the Gulf of Mexico last week were exempted from environmental review before their approval. Thirteen workers were rescued after a fire broke out on a platform operated by Mariner Energy Thursday morning. According to the Center for Biological Diversity, regulators approved the wells with the same type of environmental waiver used to approve BP’s Deepwater Horizon project. The Obama administration has since banned the waivers for deepwater drilling, but not for the shallow-water wells served by Mariner Energy.