Passage: The Kola Superdeep Borehole (Russian) shine sakamakon aikin hakowa na kimiyya na Tarayyar Soviet a cikin Pechengsky District, a kan Kola Peninsula. Aikin ya yi ƙoƙarin yin zurfin zurfin zurfin zurfin zurfin ƙasa. An fara hakowa a ranar 24 ga Mayu 1970 ta amfani da Uralmash-4E, kuma daga baya Uralmash-15000 jerin hakowa rig. An hako ramuka ta hanyar rarraba daga rami na tsakiya. Mafi zurfi, SG-3, ya kai mita 12,262 (40,230 ft; 7.619 mi) (Bukatar tabbatarwa. Dangane da alamun da aka rubuta akan ramin, zurfin ramin yana da zurfin 12,226 m, 1989 a zurfin) kuma shine mafi zurfin zurfin zurfin zurfin zurfin ƙasa, kamar yadda na Mayu 2019.
24 ga watan Mayu 1970