3 days after people, Almost 4000 oil rigs in the Gulf of Mexico continue to pump out oil. They have been running on their own power since humans disappeared but without any consumption the oil rigs shut down. 34,000 miles of undersea pipes clog with undelivered oil but watertight valves will keep the oil from leaking into the ocean.
50 years after people, Five decades of hurricanes have reduced the nearly 4000 oil rigs in the Gulf of Mexico to one. The last oil rig is finally knocked over by a large wave.
110 years after people, The sunken oil rigs have become new ecosystems. They have become artificial reefs teeming with life.