Yes, I came across that. Then I remembered the video about glacial lakes with a thin ice coating. When the ice starts to melt, it cracks and causes the "plates" to form around itself. Notice the blue water in many areas of it. Some of the shapes in the video were actually nearly perfect circles. When I first saw these shapes, my first impression was that it was the foundation walls of a fort or village - something like that. My hopes were dashed when I saw the video. Oh well!