Climate activist swims under the Antarctic ice sheet

Pugh is known for swimming in arctic water to raise awareness for climate change, but on January 23, he became the first person to swim in a supraglacial lake: a lake that has formed on top of a glacier due to melting ice.

source https://www.cnn.com/videos/world/2020/02/03/climate-activist-ice-sheet-swim-antarctic.cnn