A journey of a thousand miles begins with a single step.
Deep blue icebergs are rare. But when you come across one it's a sight to behold. This blueberg is huge - refer to the boat on its left for comparison.
These icebergs were once part of old glaciers that underwent tremendous pressure over centuries. The pressure removed the air within that was caught by the falling snow during formation. The high density and the lack of any reflective surface means that longer wavelengths (red) are absorbed (instead of being reflected) giving these icebergs their deep blue colour.