Completely surrounded by blue water in Iceland, you see vertical cliffs fall dramatically from the surface to the bottom of a long crevasse in front of you while diving. This site has become world renown among sports divers and now ranks among many of the other “must-experience” places like the Great Barrier Reef, the Red Sea, Thailand and Indonesia. A visibility like this is one of those things that have to be seen to be believed. Cold and very old. After some time in the water, it slowly becomes easier to comprehend the visibility, and then there is plenty of time to think about the nature of the phenomenon.