CNN
Fifty-year-old Lewis Pugh is known for swimming in Arctic water to raise awareness for climate change, but on Jan. 23, he became the first person to swim in a supraglacial lake—a lake that has formed on top of a glacier because of melting ice.
Fifty-year-old Lewis Pugh is known for swimming in Arctic water to raise awareness for climate change, but on Jan. 23, he became the first person to swim in a supraglacial lake—a lake that has formed on top of a glacier because of melting ice.