This Tabular (tablelike) iceberg.
“Shortly after lunch we passed within a few hundred meters of a spectacular tabular iceberg that was several miles long and wide. Likely a piece of the Larsen B Ice Shelf, this piece had broken off and drifted north. The scale was hard to believe. The vertical walls of ice that climbed 100 feet from the sea were only the proverbial tip of the iceberg as 85% of the mass lay below the water.” from ships log
Blue is from the ice which has compressed all the gas inside so much that the apparent color is blue from light scattering, much like a blue sky. In fact I have desaturated this image somewhat. An absolutely unforgettable sight.
Canon 1DsIII 24-70 (42) 2.8L f8 1/125