AP Photo

Krafla is in the north of Iceland. This dip in the landscape is a caldera ten kilometres wide – a geological feature like a cauldron, created when the core of a volcano collapsed in the distant past.

The crater Víti is inside Krafla. Víti means “Hell” in Icelandic. In 1724 this crater erupted.

Icelandic scientists have drilled a two-kilometre deep well into the crater to judge opportunities for utilising this deep geo-energy.