Photographer Olivier Grunewald (www.oliviergrunewald.com) approaches as closely as possible to the lava lake of Mount Nyiragongo in the Democratic Republic of Congo during an expedition of the Society of Geneva Volcanology (SVG). The images were shot by Peter Vetsch from the camp installed during nine days in the crater. Olivier will be the third of the team to reach the shore of the eight million cubic meters of lava bubbling after Marc Caillet and Franck Pothé. Excerpt from Olivier Grunewald's film, "Nyiragongo, Journey to the Center of the Earth".