Jordi Chias / Angular roughshark (Oxynotus centrina) a deepsea species living at 80-300m depth, caught by fishermen and released, Costa Brava, Catalunya, Spain, Mediterranean Sea

Franco Banfi / Humboldt squid (Dosidicus gigas) attracted to 'squid jig' bait which glows at night off Loreto, Sea of Cortez, Baja California, Mexico, East Pacific Ocean.

Franco Banfi / Humboldt squid (Dosidicus gigas) at night off Loreto, Sea of Cortez, Baja California, Mexico, East Pacific Ocean.

Franco Banfi / Scuba diver and Humboldt squid (Dosidicus gigas) at night off Loreto, Sea of Cortez, Baja California, Mexico, East Pacific Ocean. August 2007.

Franco Banfi / Humboldt squid (Dosidicus gigas) cannibalising another squid of the same species at night off Loreto, Sea of Cortez, Baja California, Mexico, East Pacific Ocean.

Franco Banfi / Humboldt squid (Dosidicus gigas) at night off Loreto, Sea of Cortez, Baja California, Mexico, East Pacific Ocean.

Franco Banfi / Mexican fisherman boat at dusk, fishing Humboldt squid (Dosidicus gigas) , at night off Santa Rosalia, Sea of Cortez, Baja California, Mexico, East Pacific Ocean.

Jordi Chias / Atolla jellyfish (Atolla wyvillei) with Gentoo penguin (Pygoscelis papua) in the background near the surface. Antarctic Peninsula. Finalist in the Underwater category of the Wildlife Photographer of t...

Solvin Zankl / Deepsea Basket star (Gorgonocephalus lamarckii) specimen, from the North Atlantic near Iceland.

Solvin Zankl / Deepsea Viperfish (Chauliodus sloani) specimen from the North Atlantic near the North West of Spain, at a depth of 560-580m.

Solvin Zankl / Deepsea Octopus (Bathypolypus bairdii) specimen from the North Atlantic, near the Faroe Islands at a depth of 805m

Solvin Zankl / Illuminated netdevil (Linophryne arboritera), female specimen, from deepsea Atlantic Ocean near Cape Verde at a depth of 1900m.