A Destination for Conservation: oil rigs have a obligate symbiotic relationship with marine life. - This stunning image was taken below one of the oil rigs in the Beta Field, near Long Beach California. These oil rigs have 30 years of biomass encasing the submerged metal structural beams and columns. They have become an accidental artificial reef. The oil rigs provide growing support for coral and sponges and has become an ecosystem and home for thousands of important fish, marine mammals, and invertebrates.