Constantinos Petrinos / Sunset reflected on the surface of the Aegean Sea on a calm day with a speedboat, Evia Island, Greece. July 2014.

Stephen Dalton / Close up of Jumping Spider (Philaeus chrysops) Corfu, Greece, May.

Franco Banfi / Nudibranch (Cratena peregrina) on a sponge, Ist Island, Croatia, Adriatic Sea, Mediterranean.

Franco Banfi / Nudibranch (Janolus cristatus) Vela Luka, Korcula Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Nudibranch (Flabellina affinis) Vela Luka, Korcula Island, Croatia, Adriatic Sea, Mediterranean.

Alex Mustard,Alex Mustard / A portrait of a Mediterranean anthias (Anthias anthias) against open water. Secca Del Papa, Tavolara Marine Protected Area, Sardinia, Italy. Mediterranean Sea.

Alex Mustard / A fisherman swims down to touch the statue of Christ Of The Abyss (Cristo degli abissi) for good fortune, in the Marine Protected Area of Portofino (Area Marina Protetta, Portofino), Liguria, Italy. M...

Pedro Narra / Bottlenose Dolphin (Tursiops truncatus) family swimming near the surface, Sado Estuary, Portugal

Alex Mustard,Alex Mustard / Divers explore mediaeval mill building, now flooded in Capodacqua lake. Gran Sasso National Park, Abruzzo, Italy.

Franco Banfi / View of Procida, the small harbour of Corricella, island near Ischia Island, Italy, Tyrrhenian Sea, Mediterranean

Franco Banfi,Franco Banfi / Anchor on Wreck Vassilios T, Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Scuba diver and yellow sponges (Aplysina cavernicola) on Brioni Steamship wreck, Vis Island, Croatia, Adriatic Sea, Mediterranean. Model released.