An eyewitness, who was skating on the frozen glacial lake about a 56-mile drive southeast from Anchorage, said she heard noises and then saw the glacier break off, or calve, according to KTUU. A video she shared with the outlet shows the moment the chunk of glacier fell in a thunderous crash.

This is the moment the Portage glacier near Whittier, Alaska calved and crashed into the frozen Portage Lake, causing huge waves to break the icy lake's surface apart. Reports say two people ice skating on the lake at the time became trapped and had to be rescued.

Hollywood legend Kevin Costner ruminates on President Teddy Roosevelt in the new Fox Nation limited series 'Yellowstone to Yosemite.' Occurred on0, 2025 / Anchorage, Alaska, USA Info from Licensor: "Portage glacier calving onto the frozen lake.