Nuno Sa / Blue Shark (Prionace glauca) with diver in background. Santa Maria, Azores, September.

Jeff Rotman / Looking down on the shipwreck of the small freighter 'Ora Verde' that sank in 1980, Grand Cayman Island, Caribbean Sea Model released.

Juergen Freund / Shovelnose ray (Rhinobatidae) on the sandy bottom with a diver. Tigabu Island, Malaysia, June 2009. Model released.

Juergen Freund / Massive barrel sponge (Xestospongia testudinaria) and diver. Tubbataha Reef National Marine Park, Palawan, Philippines, April 2009. Model released.

Juergen Freund / Shoal of schooling Coral razor / Shrimp fish (Aeoliscus strigatus) with diver on hard coral reef, North Sulawesi, Indonesia.

Juergen Freund / Giant manta ray (Manta birostris) at a cleaning station with diver swimming behind it. North Raja Ampat, West Papua, Indonesia.

Juergen Freund / Light streaming into a shallow cave in a dive site called The Passage, with a diver swimming up towards the foliage visible above. North Raja Ampat, West Papua, Indonesia, February 2010. Model release...

Juergen Freund / Diver watching a swimming Dugong (Dugong dugon). Dimakya Island, Palawan, Philippines, April 2010.

Juergen Freund / Jewelmer Pearlfarm, cleaned Pearl oysters (Pinctada maxima) in hanging cages, being relocated to the open sea, Palawan, Philippines, May 2009

Juergen Freund / Giant manta ray (Manta birostris) at a cleaning station with diver looking up at it. North Raja Ampat, West Papua, Indonesia, February 2010

Claudio Contreras / Great white shark (Carcharodon carcharias) passing divers cage, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, Pacific ocean, September

Jeff Rotman / Divers remove long-line fishing hook from Tiger shark (Galeocerdo cuvier) Bahamas, Caribbean Sea. Model released.