Tazieff ,the Polish scientist,went to Lake Kivu in
the Congo in 1948 to observe a new volcano which he called Kivuro . After taking photographs ,he has to leave almost at once because a river of liquid rock threatened to surround him. He escaped just
in time but he returned two days later when the volcano had become quiet. This time he climbed into the mouth of Kivuro
in order to take photographs and measure temperatures.