The Gulf of Mexico is home to thousands of gas and oil platforms, in addition to some of the planet's most severe storms. So who do you call when a well or platform stops producing, or is toppled by a massive storm? Meet the Delta Divers, a team of highly skilled underwater adventurers who descend where few dare to go to 300 feet below the water's surface. National Geographic joins them as they head out to dismantle offshore rigs.