Virtual cities on the sea, offshore oil and gas platforms and the rigs that drill them, are among the largest manmade objects on Earth. Built to survive drilling disasters, hurricanes, and iceberg impacts, these mammoth structures are expensive and complicated to dismantle once they've finished their job, requiring a sophisticated team of experts and high-tech tools. In this larger than life program, get a firsthand look at the unique challenges involved in decommissioning these phenomenal manmade islands. Take a trip to the Gulf and learn how the rigs are designed and built. Next, visit Bisso Marine in Houston, Texas, to find out how this busy salvage and heavy lifting company removes these steel giants from the ocean floor. Finally, discover how instead of being dismantled, many of today's defunct oil rigs are being given a new life as floating hotels, artificial reefs, and even producers of clean and renewable energy. From destruction to renovation to transformation, History presents the ultimate look at the life cycle of Oil Rigs.