Goma Volcano Observatory: Stephane and the observatory's Director discuss the gas content of Lake Kivu. | Director Célestin Kasereka Mahinda explains the geology of Nyiragongo and Nyamulagira volcanoes. | He then shows us the real-time seismograms provided by the seismic network around Nyiragongo volcano. | Honoré shows Stephane the temperature evolution of Nyiragongo's North-South fissure. |