Oil and gas producers have increased their exploration, drilling, and production activities. The risk/reward ratio of these drilling efforts is matched by concerns about environmental accidents and damage to equipment. Operator's extra expense insurance is designed to cover the cost of well control, seepage, and pollution, removing and nullifying, cleanup and containment, and re-drilling expenses as a result of a blowout. Coverage can be endorsed to cover underground blowouts, "unlimited" re-drilling, and offshore operations.