Long before offshore oil rigs are put together, much less sent out into the open ocean, they're expertly designed. Schematics are drawn up, and in many cases, engineers will take these plans and ...

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Any offshore oil rig that extends past 1500 meters is considered to be an ultra-deepwater production facility. However, that's still nowhere close to the deepest man has explored in the ocean.

Callahan, 30, is a commercial diver working on offshore oil rigs. When he gets the call to go on site, he can be there for weeks on end, diving every 12 hours.