The film is dedicated to the work of the Soviet complex expedition to study the rift in East Africa. Eruption. The aftermath of the earthquake in Peru. Types of African lakes, Lake Baikal. Arrival of the Soviet delegation to Nairobi. General view of Nairobi - the capital of Kenya. Burning savannah. Advancement of the expedition to the research site. View of the active volcano Oldonia-Lengai. Fauna of Kenya: lions, giraffes, elephants. Kilimanjaro Hills. General view of African rifts. Members of the expedition at the conditional point of the Equator, while moving through the jungle, while collecting rock samples. Expedition on the shores of Lake Kiwi. Rest of the expedition members on the shore of the lake. General view of Lake Albert and the waterfall. Walk of the members of the expedition on a steamer on the lake. View of crocodiles, hippos in the lake. An expedition visit to one of the villages, acquaintance with the locals. Analysis and study of samples brought from Africa to the laboratories of the Institute of Geophysics.