I saw this and really liked it. The artist is Jason de Caires. In May 2006 he gained international recognition for creating the world’s first underwater sculptural park in Grenada, West Indies. His underwater sculptures are designed to create artificial reefs for marine life to colonize and inhabit.
His website stated that only about 10-15 percent of the sea bed has a solid enough substratum to allow reefs to form naturally. In order to increase the number of reefs in these areas, the artificial reefs have recently been created from materials that are durable, secure and environmentally sensitive. These reefs have been successful in that they have attracted coral growth which in turn support an entire marine ecosystem.
Here is his website if you want to check it out. He has made over 400 life size sculptures that have been placed underwater. I really like the fact that his art is serving a purpose.