Pascal Kobeh / 'Lotus', an artificial reef built in 2001 with a steel frame with a mild electrical current which encourages the growth of coral, Ihuru Island, North Male Atoll, Maldives, Indian Ocean. Small reprodu...

Franco Banfi / Hard and soft corals and encrusting sponge on the structure of bio-rock, Karang Lestari Pemuteran project, Desa Pemuteran, Bali Island, Indonesia, Pacific Ocean

Franco Banfi / Corals attached to structure of bio-rock, a method of enhancing the growth of corals and aquatic organisms, Karang Lestari Pemuteran project, Desa Pemuteran, Bali Island, Indonesia, Pacific Ocean.

Franco Banfi / Corals attached to structure of bio-rock, a method of enhancing the growth of corals and aquatic organisms, Karang Lestari Pemuteran project, Desa Pemuteran, Bali Island, Indonesia, Pacific Ocean.

Alex Mustard / Diver exploring the wreck of HMS Scylla, which is colonized by Dead man's fingers (Alcyonium digitatum). Whitsands Bay, Cornwall, England. UK, July.

Doug Perrine / Barjacks (Caranx ruber), Yellowtail snapper (Ocyurus chrysurus), and Sergeant major damselfish (Abudefduf saxatilis) swimming around wreck of bow gun on C-58 shipwreck off Puerto Morelos, near Cancun,...

Doug Perrine / Giant squirrelfish (Sargocentron spiniferum) at cleaning station in the cockpit of wreck of Panorama Air Tour Beech H18S that crashed in 1983 after take-off from Keahole airport, Kona, Hawaii.

Georgette Douwma / Green turtle (Chelonia mydas) with two large remoras (Echeneis naucrates) attached to its carapace, at rest on artificial reef. Mabul, Malaysia.

Georgette Douwma / Crinoid (Crinoidea) on artificial reef. Mabul, Malaysia.

Georgette Douwma / Crinoid (Crinoidea) on artificial reef. Mabul, Malaysia.

Georgette Douwma / Granulated sea star (Choriaster granulatus) on artificial reef. Mabul, Malaysia.

Georgette Douwma / Cock's comb oyster (Lopha cristagalli) covered with encrusting sponge on artificial reef. Mabul, Malaysia.