A mind-boggling natural event unfolded in East Greenland when a gigantic glacier collapsed into the ocean, sending colossal waves roaring through a remote fjord. Researchers and crew aboard the British Antarctic Survey (BAS) flagship vessel RRS Sir David Attenborough witnessed and captured the epic calving event near Sorgenfri Gletsjer, releasing details and footage on BAS News . But first, check out the chaos below. It's like a scene from an apocalypse movie. The crumbling ice face measured over one kilometer wide and averaged 100 meters thick, unleashing a staggering 18 million metric tons of ice into the sea all at once. As the skyscraper-sized icy monoliths plunged into the freezing water, they unleashed massive, churning displacement waves that radiated across the fjord. Captain Matt Neill, Master of the RRS Sir David Attenborough , described the heart-pounding spectacle: "At the time of calving, our ship was more than a kilometre away from the front of the glacier.…