[PBS NewsHour]

WATCH: Visiting the Most Vulnerable Place on Earth: the ‘Doomsday Glacier’

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The Thwaites Glacier is the largest, most menacing source of rising sea levels all over the world, and it is melting at an alarming rate.

For years, scientists have warily watched it from afar, but in November, a team set out on a perilous journey to investigate what is happening below.

PBS NewsHour science correspondent Miles O’Brien reports on what they discovered.