Endurance swimmer Lewis Pugh describes the harsh dangers & absolute beauty of swimming in a glacial river under the ice sheet in Antarctica in just his Speedos to highlight the devastating effects of climate change.

Lewis explains how all of our futures will be determined by the polar regions which are melting at a frightening rate. He continues to push himself to the absolute limit to encourage global leaders & policy makers to be courageous & take the urgent action that’s needed – now.

Photographs by Kelvin Trautman