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Kola superdeep borehole in Murmansk region
May 1-16, 1989. USSR. Murmansk Region. Drillers V. Uporov and P. Korchagin (left to right) during a work shift on the Uralmash-15000 drilling rig during the sinking of the Kola superdeep borehole at a depth of more than 12 thousand meters for geophysical research at great depths. The exact date of the shooting has not been established. Semyon Meisterman/TASS