The falling number of oil and gas rigs deployed across the United States is reaching a level that would indicate onshore ...

Using a moveable rig, the wells are drilled and pass gas and oil via pipelines to a production platform. Subsea systems can be used at depths of up to 2100 meters.

As it stands, roughly 12,000 offshore oil and gas rigs pepper the world's coastlines. These platforms typically operate for between 20 and 40 years.

Platforms contain dorms, withstand hurricanes, and in the Gulf alone offshore rigs have produced more than 23 billion barrels of oil.

Today 13 of California’s 27 remaining offshore platforms are what’s known as shut-in, or no longer producing oil. Platform Holly is among the dead platforms awaiting their afterlives.