ANTARCTICA McMurdo Sound - 29 Nov, 2017 - Aerial image shows an iceberg floating in McMurdo Sound Victoria Land Antarctica.

ANTARCTICA McMurdo Sound - 29 Nov, 2017 - Aerial image shows an iceberg floating in McMurdo Sound Victoria Land Antarctica. The part of the iceberg below water appears bluest primarily due to blue light from the water in the Sound. The undersides of some icebergs can be eroded away, exposing older, denser, and incredibly blue ice. Erosion can change an iceberg’s shape and cause it to flip, bringing the sculpted blue ice above the water’s surface. The unique step-like shape of this berg - compared to the tabular and more stable berg in the top-right of the image—suggests that it likely rotated sometime after calving