Giant sinkholes in Arctic seafloor observed for the first time - CNN.com | Agents of Behemoth | Scoop.it
From www.cnn.com - March 14, 2022 4:44 PM

Marine scientists have discovered deep sinkholes -- including one larger than a city block of six-story buildings -- and ice-filled hills that have formed "extraordinarily" rapidly on a remote part of the Arctic seafloor.