A mysterious 70-mile crack has opened up in an ice sheet in Antarctica which scientists say threatens to destroy a nearby research station.

The Halley VI research station is currently being relocated as the crack continues to grow bigger.

“If [the crack] continues to move and the ice breaks off, the station would be on the wrong side of the crack,” Athena Dinar, a spokesperson for the British Antarctic Survey said.

Livescience.com reports:

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.

According to NASA Ice, an Earth sciences program at NASA, this rift is relatively new — it showed growth on satellite imagery just this year. The U.K.-based Antarctic research group the MIDAS Project first observed the rift in 2014 and has been tracking it ever since.

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. In 2002, the nearby ice shelf Larsen B partially collapsed after showing similar rifting, NASA’s Earth Observatory reported earlier this year, when it showed the collapse alongside a satellite image of the growing Larsen C crevasse.

According to the MIDAS Project, the eventual calving of the Delaware-size sheet of ice would remove between 9 percent and 12 percent of Larsen C’s surface area and may lead to the crumbling of the entire ice shelf.