70-mile-long, 300-foot-wide crack opens in Antarctica.

Not that anything’s trying to get out. No, Live Science wouldn’t want us to panic needlessly over a gigantic crevice yawning wide across shrinking ice-fields of the least-understood continent on Earth:

Snapped by scientists on NASA’s IceBridge mission, the shot shows a rift in Larsen C, an ice shelf that is floating off the Antarctic Peninsula. When the crack eventually spreads across the entire ice shelf, it will create an iceberg the size of the state of Delaware, according to IceBridge. That’s around 2,491 square miles (6,451 square kilometers).

As of Nov. 10, when the IceBridge scientists observed this crack, it was 70 miles (112 km) long and more than 300 feet (91 meters) wide. The dark depths of the crack plunge down about a third of a mile (0.5 km), all the way through the ice to the ocean below.

Larsen C is Antarctica’s fourth-largest ice shelf, and it holds back the land-based glaciers just behind it: Once the ice shelf goes, those slow-flowing glaciers have one less barrier in their journey toward the sea.

(By the way, the big story today seems to be the discovery of an actual dinosaur feather that’s been preserved in amber. Just in case you missed it.)

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