Yakutia. Megino-Kangalassky district. The hydrometeorological station of the Permafrost Institute of the Yakutsk Branch of the USSR Academy of Sciences, located in the area of the Big Ice (Ulakhan Taryn). Expedition of hydrologists at Lake Maacchaia. Work on the compilation of a permafrost hydrogeological map. Among the staff of the station: L. Doktorova, P. Dubrovin, V. Shepelev, EE Zhirkov. Members of the expedition around the fire, singing with a guitar.