Blue Ice from Greenland
Blue icebergs are just upside down. When the ice from above the water melts, the smooth portion of ice from below the water to overturn.
Photos courtesy of: Visit Greenland from Nuuk, Greenland, CC BY 2.0 https://commons.wikimedia.org/wiki/File:Blue\_ice\_in\_South\_Greenland\_-\_Visit\_Greenland.jpg