Eric Walker removed "Кольская сверхглубокая скважина" from Kola Superdeep Borehole SG-3

Eric Walker added "Кольская сверхглубокая скважина" to Kola Superdeep Borehole SG-3

Eric Walker added Kola Superdeep Borehole - Wikipedia to Kola Superdeep Borehole SG-3

Eric Walker added Kola Superdeep Borehole SG-3 to Soviet Union