December 5, 2007—A scuba diver swims around an artificial reef in Pemuteran, Indonesia on January 18, 2004.

The reef, part of a project dubbed the "Bio-Rock", is the creation of scientist Thomas Goreau and the late architect Wolf Hilbertz.

The metal structures submerged in the bay off Bali's northwestern shore are fed by cables that send waves of low-voltage electricity, which spurs the coral to revive itself.

Similar structures have been set up in about 20 countries, but the Bali experiment is the most extensive.

Bali's corals have suffered from rising temperatures and destructive fishing methods.

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