Alex Mustard / Southern stingray (Dasyatis americana) two swimming over sand bar, under stormy sky. Grand Cayman, Cayman Islands. British West Indies.

Oscar Dewhurst / Mute swan (Cygnus olor), two cygnets sheltering under parent's wing. Richmond Park, London, England, UK. April.

Jordi Chias / Crabeater seal (Lobodon carcinophaga) hunting under water, Antarctic Peninsula, Antarctica.

Nick Hawkins / Underneath view of a North American beaver (Castor canadensis) swimming under the ice of a frozen river. Quebec, Canada. October.

Nick Hawkins / Atlantic salmon (Salmon salar) under river ice. Quebec, Canada. October.

Juergen Freund / Moral eels, Urchins, Cuttlefish, Shrimp and other marine life living within a discarded tyre and fishing net under a ships' harbour, Maluku, Indonesia. November.

Juergen Freund / Guttering to redirect water at the Daintree Drought Experiment, where rainforest plants grown under cover to see how they respond to drought. Daintree Rainforest Observatory, northern Queensland, Aust...

Doug Gimesy / Platypus (Ornithorhynchus anatinus), released onto a log in Little Yarra River, Yarra junction, Victoria, Australia. Photographed under controlled conditions. April 2018.

Jack Dykinga / Gaucho herding horses on the shoreline of Lago Almarga in the morning light, with Torres del Paine mountains in background under stormy skies. Patagonia, Chile.

Remi Masson / Water lilies (Nymphaea alba) lit by the sun's rays, seen under water. Alps, Ain, France. June. Highly commended in the the Underwater World category, GDT European Wildlife Photographer of the Year 201...

Theo Bosboom / Autumn leaves from Beech trees, Oak trees and Birch trees floating under water in the current of a mountain stream, La Hoegne, Ardennes, Belgium.

Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) waiting for salmon under moonlit sky, Lake Clark National Park, Alaska, USA, August