In this amazing capture we see the bottom of an iceberg that just rolled over. According to Reddit user thirdfounder, this is an example of a ‘bottom berg’ where a chunk of ice has calved from the lower part of a glacier. Apparently the stunning blue color is the result of a lack of entrained air bubbles in very old and highly compressed ice. Combined with a higher content of rock flour, and this deep blue colour is achieved.

A reverse image search on Google and Tineye did not reveal an original source for this picture. If you know who the photographer is, please advise in the comments!