Divers descend onto a deep wreef with red sea whip corals, Fiji.

Red sea whip coral in deep water beneath a large coral bommie, Fiji.

Soft and hard corals make a coral bommie surrounded by anthias and other small reef fish, Raja Ampat, Indonesia.

Underwater view of giant clam (Tridacna spp), Pixies Bommie, Great Barrier Reef, Queensland, Australia, Pacific

Underwater view of giant clam (Tridacna spp), Pixies Bommie, Great Barrier Reef, Queensland, Australia, Pacific

A coral bommie full of reef fish and healthy corals, Red Sea.

A coral bommie full of life, Maldives.

A coral bommie in the Red Sea at Yolanda Reef is full of anthias fish.

Blue starfish (Linckia laevigata) cling to a coral bommie in Indonesia. This species of seastar is common throughout the Indo-Pacific.

Cardinalfish school around a colorful coral bommie growing on a reef in Raja Ampat, Indonesia.

Reticulated dascyllus (Dascyllus reticulatus) hover over coral bommie, Rongelap, Marshall Islands, Micronesia, Pacific

Massive table coral (Acropora sp.), Rongelap, Marshall Islands, Micronesia, Pacific

Coral Fields Blue Coral Bommies, (Heliopora sp.) and divers. Gorontalo, Sulawesi, Indonesia. (rr)

Coral Fields Blue Coral Bommies, (Heliopora sp.) and local fishing boat. Gorontalo, Sulawesi, Indonesia. (rr)

Branching corals (Acropora sp.), Rongelap, Marshall Islands, Micronesia, Pacific

Coral bommies in sandy substrate, Rongelap, Marshall Islands, Micronesia, Pacific