A British explorer has braved sub-zero temperatures to become the first person to swim at the North Pole.
Lewis Gordon Pugh took to the freezing waters on Sunday to highlight the devastating impact of climate change on the natural world.
It took him 18 minutes and 50 seconds to swim one kilometre (0.6 miles) in waters created by melted sea ice at temperatures of minus 1.8 Celsius (29 Fahrenheit) - the coldest a human has swum in.
The 37-year-old said he was ecstatic to have completed the swim, but added it was a tragedy that it was possible to swim at the Geographic North Pole because of global warming.
Pugh, an environmental campaigner, has completed a number of aquatic feats, including swimming the length of the Thames last year, to raise awareness of environmental issues.
His ability to raise his body temperature in anticipation of a swim in cold waters has intrigued top sports scientists and has earned him his "Polar Bear" nickname.