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A large iceberg which has rolled over many times showing striations etched in the berg caused from trapped air and waves. Blue icebergs aren't really blue. They're perfectly clear, which allows light to pass through. Since ice filters out all colors except blue, the iceberg emits blue light. Typically blue ones are very compressed originating from the bottom of a glacier. This ice has been under enormous pressure for thousands of years. Most of the air, and therefore, most of the reflective surfaces within the iceberg have been eliminated. Light hitting this iceberg no longer "bounces" off of it. Instead, it is absorbed into it. The weaker wavelengths of light are quickly filtered out. The blue wavelength, however, has enough energy to penetrate deep enough to either find some internal surface to reflect back from or penetrate all the way through the dense iceberg and thus giving it its blue color. Sometimes it actually looks like blue icebergs are emitting light. The blue you see is actually being produced by the sun as daylight. This iceberg is simply capturing the sun's emitted light and only allowing the high-energy blue wavelengths to escape. This particular blue iceberg was estimated to be 80,000 years old. Once they hit water they typically only last a few years. This is probably my all time favorite Antarctica image. The sky was cloudy and there was hardly any light as our boat approached this iceberg. Just as we are along side it and moving at a good clip the sun breaks through the clouds and the moment I click the shutter the bird takes off from the iceberg catching the backlight on the wings. A second later the sun went back in and the shot was gone.