Iceland is a land of incredible wonders, unlike anywhere else in the world. Volcanologists there seek to understand how volcanos, which are very common on the island, function. Here, they have discovered an empty magma chamber in the Thrihnukgigur volcano, dormant for 3000 years. Unique because it is like a plug was pulled on the chamber, and all the magma suddenly drained away, it offers scientists like Einar Stefansson, pictured here rappelling down into the massive chamber, a one of a kind chance to see what the magma left. Obviously, adventure is one great fringe benefit to the study of volcanos in Iceland!