An iceberg measuring 492 feet thick and 490 square miles broke off from the Brunt Ice Shelf on Friday, according to a press release from the British Antarctic Survey (BAS). The section, measuring larger than New York City, cleaved near BAS’s Halley Research Station, which was closed for the season earlier this month.

The research station likely will not be impacted by the break. Researchers say the first indication of calving came last November when a crack known as the North Rift became active, rupturing towards a chasm known as the Stancomb-Wills Glacier Tongue almost 23 miles away.

“The iceberg was formed when the crack widened several hundred meters in a few hours on the morning of 26th Feb, releasing it from the rest of floating ice shelf,” BAS noted in a press release.

BAS Director of Operations Simon Garrod called the break “a dynamic situation.” Three cracks have been detected over the course of a decade, including the Halloween Crack and Chasm 1.

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