Alex Mustard / A diver explores Silfra Canyon, a deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates at Thingvellir National Park, Iceland. May 2011. In this phot...

Clay Bolt / Entomologist and bee expert Eli Wyman with the first rediscovered individual of Wallace's giant bee (Megachile pluto) Mollucas, Indonesia. January 2019. Model released.

Clay Bolt / Entomologist examining a large female Megachile bee during the hunt to rediscover Wallace's giant bee (Megachile pluto) on the island of Ternate, North Moluccas, Indonesia. January 2019

Clay Bolt / Composite image of Wallace's giant bee (Megachile pluto) with European honey bee (Apis melifera). This is the world's largest bee, which is approximately 4 times larger than a European honey bee. One...

Jim Brandenburg / Shoreline, Discovery Lake, Boundary Waters Canoe Area Wilderness, Minnesota

Juan Carlos Munoz / People exploring underground lakes via rigid inflatable boat, Cross Cave (Krizna jama) under Cross Mountain, Green Karst, Slovenia, October 2014.

Orsolya Haarberg / High angle view of person walking on frozen lake of cracked ice. Lofoten Isands, Norway. January. Highly commended in the Landscape Category of the Oasis Photography Competition 2017. Highly commended...

Pascal Kobeh / Giant clam (Tridacna) on 'Lotus' artificial reef, built in 2001 with a steel frame using mild electric currents to encourage coral growth, with diver in the background. Vabbinfaru Island in North Male...

Ole Jorgen Liodden / Walrus (Odobenus rosmarus) underwater view, Edgeoya, Svalbard, Norway, June.

Floris van Breugel / Aurora Borealis over yellow tent lit from within and mountainous scenery, Arrigetch Peaks, Gates of the Arctic National Park, Brooks Range, Alaska, USA, August 2014.

Doug Perrine / Rough-toothed dolphins (Steno bredanensis) Keauhou, Kona, Hawaii, USA, Central Pacific Ocean.

Olga Kamenskaya / Diver with Baikal sponges (Lubomirskia baicalensis). Lake Baikal, Russia, March 2007. Model released.