Krafla is a typical example of a caldera volcano (as a result of a massive eruption, the surface of the mountain collapses and is currently cut by steam-vents with bubbling sulfur). There is now a power plant in its area that is drilling into magma. Iceland is the only place in the world where magma is cored.
The noise of the power plant is so great that you have to plug your ears or put on special headphones while nearby. I recorded my sound at quite a distance – about two kilometers from the center of the action, and it was very, very loud anyway. Like the sound of several jets starting at once.
