To Dive Silfra is to dive between the Eurasian and North American continents.
Diving Silfra is said to be a once in a life time experience. The Silfra Rift is the tectonic boundary between the Eurasian and North American plates. You can literally touch both continental plates as you see a diver doing in the following video.
The waters of Lake Thingvellir has some of the cleanest water in the world due to glacial runoff and a filtration through Iceland volcanic underground. Therefore, the visibility is among the finest in the world in which to experience the magnificent underwater landscapes.
The following video documents what is like as well as the dive equipment needed to dive Silfra.
Watch the following short video describing the Silfra Dive experience.