Kola superdeep borehole in Murmansk region

December 1-28, 1983. USSR. Murmansk Region. Members of one of the best drilling crews in the Kola expedition: assistant driller Nikolai Andreyev, driller Nikolai Khmelev, assistant drilling foreman Ivan Svetlichny, fitter Vladimir Dovbych, driller foreman Viktor Kirpichnikov, fitter Anatoly Tumakov and assistant driller Sergei Klyuchnikov (from left to right) drilling the Kola superdeep borehole using the Uralmash-15000 drilling rig for geophysical exploration at great depths. The exact date of the photo has not been established. Semyon Meisterman/TASS