00:00The largest glacier in the world is falling apart, and it could drown entire cities.
00:05Deep in Antarctica, the Thwaites Glacier, nicknamed the Doomsday Glacier, is nearing collapse.
00:11It's nearly 80 miles wide and holds enough ice to raise global sea levels by up to 11 feet.
00:17If that happens, major coastal cities could vanish underwater.
00:20Right now, the only thing holding it back is a floating ice shelf.
00:24But scientists say that shelf is breaking.
00:26Using cutting-edge satellite data from NASA, researchers at Penn State have developed a new way to track fractures in the ice.
00:33These cracks spread like spiderwebs and speed up the glacier's flow into the ocean.
00:38The eastern side is fracturing rapidly, while the western side remains more stable.
00:43But if one part breaks, it could trigger a chain reaction.
00:46This isn't just about ice. It's about time. And we may be running out of it.
00:52Scientists are now building the first high-resolution tools to predict when the next big break might come.
00:57Their goal is simple. Spot the collapse before it happens.
01:01Because once it goes, there's no putting it back together.
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