Holes the size of city blocks are forming in the Arctic seafloor
![](https://weirdnews.info/wp-content/uploads/2022/03/Arctic-seafloor-holes-permafrost-scn-exlarge-169-601x220.jpg)
An autonomous underwater vehicle is recovered after completing a seafloor mapping mission in the Arctic Ocean. The remotely operated vehicle (foreground) is used to conduct visual surveys of the newly mapped seafloor. – By Katie Hunt, CNN Updated 2022 Mar 14 – Sign …