The Most Extreme Volcano on Earth? | NOVA | PBS

Mount Erebus is the southernmost active volcano on Earth, and its summit sits close enough to McMurdo Station that a helicopter can get researchers there in minutes. Hosts Caitlin Saks and Arlo Pérez hike its flanks in seventy-below wind chill to see the ice towers and gas vents that make it a natural laboratory.

Why it's free: Free on NOVA PBS's own channel; GBH first ran it on PBS Terra and NOVA republished it here.