Espen Bergersen / Humpback whale (Megaptera novaeangliae) diving. In background a diving boat and 3 divers visible in the water. Kvanangen, Troms, Norway. November

Pete Oxford / Whale shark (Rhincodon typus) and scuba divers seen from below, Cenderawasih Bay, West Papua. Indonesia.

Pete Oxford / Whale shark (Rhincodon typus) and scuba divers seen from below, Cenderawasih Bay, West Papua. Indonesia. Winner of the Man and Nature Portfolio Award in the Terre Sauvage Nature Images Awards Competit...

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...

Pascal Kobeh / Divers are setting up concrete reef balls to build an artificial reef, Philippines, Sulu Sea. August 2014.

Markus Varesvuo / Red-throated Diver (Gavia stellata) adult with two young chicks on water, Vaala, Finland, June

Markus Varesvuo / Red-throated Diver (Gavia stellata) on water, cleaning feathers, Vaala, Finland, June

Markus Varesvuo / Adult Red-throated Diver (Gavia stellata) on water with chick, Vaala, Finland, June

Markus Varesvuo / Red-throated Diver (Gavia stellata) portrait at edge of lake, Vaala, Finland, June

Markus Varesvuo / Red-throated Diver (Gavia stellata) taking off with fish, Vaala, Finland, June. Magic Moments book plate.

Markus Varesvuo / Red-throated Diver (Gavia stellata) adult with two young chicks, Vaala, Finland

Markus Varesvuo / Black-throated diver (Gavia arctica) portrait, Finland, June