Geologists say they are close to creating the hottest borehole in the world.
They are drilling into the heart of a volcano in the south-west of Iceland.
They have told the BBC that they should reach 5km down, where temperatures are expected to exceed 500C , in the next couple of weeks.
The researchers want to bring steam from the deep well back up to the surface to provide an important source of energy.
The project is located on the Reykjanes peninsula, quite near the Blue Lagoon, where a volcano last erupted 700 years ago.
A huge rig stands out against the black lava fields; inside a drill has been operating for 24 hours a day since August.
It has now descended nearly 4,500m, and the team expects it to hit its target depth of 5km by the end of the year.
http://www.bbc.co.uk/news/science-environment-38296251
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