A tour operator specialising in visiting active volcanoes has spent the night on Iceland's Eyjafjallajokull volcano.
Christoph Weber told the BBC's Pia Harold what it was like when he and photographer Martin Reitzer were allowed to walk up the volcano, which is closed to tourists.
They were able to film remarkable images of the eruptions 500 metres from the crater's edge.
Video courtesy of Christoph Weber,
Volcano Expedition International