In spring 2010, the nearly unpronounceable volcano Eyjafjallajkull spewed ash clouds across Europe, bringing international air traffic to a standstill. Now, for the first time ever, a team of explorers descend into the nearby Thrinukagigur volcano crater - the only place on earth where it is possible to enter an old magma chamber. Inside the crater, the team finds crucial evidence revealing the inner workings of Icelandic volcanoes.