Image 1: Canon EOS-1D X + Tamron 70-200mm f2.8 lens at 70mm; 1/250 sec at f3.5; ISO 2000; x2 Canon 600 flashes; 3200 lumen LED torch.
Image 2: Canon EOS 5D Mark III + 16-35 mm f2.8 lens + ND 0.6 graduated filter; 1/200 sec at f6.3, ISO 2000; Aquatech housing.
Image 3: Canon EOS 5D Mark III + 8-15mm f4 lens at 15mm; 1/160 sec at f10; ISO 2500; Canon 600 flash; Aquatech housing.
Image 4: Canon EOS 5D Mark III + 8-15mm f4 lens; 1/160 sec at f10; ISO 1000; Canon 600 flash; Aquatech housing.
Image 5: Canon EOS 5D Mark III + 8-15mm f4 lens at 15mm; 1/2500 sec at f8; ISO 2000; underwater housing + specially designed remote control.
Image 6: Canon EOS-1D X + Samyang 14mm f2.8 lens; 35 sec at f22 and at f5.6; ISO 640; x2 Canon 600 strobes; home-made underwater housing.
Audun Rikardsen, Norway
Audun grew up in northern Norway, and has always been fascinated by the Arctic coast. He is a professor of fish biology at the University of Tromsø, and most of his images are taken locally or on field work. He has won several awards, including Arctic Photographer of the Year in 2014 and the WPY Portfolio Award in 2015. Audun hopes his images will help inspire nature conservation.