Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Kola Superdeep Borehole (Rasha) shine sakamakon aikin hako kimiyya na Tarayyar Soviet a cikin Gundumar Pechengsky, a Tsibirin Kola. Aikin ya yi ƙoƙari ya yi zurfin zurfin zurfin zurfin ƙasa. An fara hakowa a ranar 24 ga Mayu 1970 ta amfani da Uralmash-4E, kuma daga baya jerin hakowa na Uralmash-15000. An haƙa ramuka ta hanyar rarraba daga rami na tsakiya. Mafi zurfin, SG-3, ya kai mita 12,262 (Bukatar tabbatarwa. Dangane da alamun da aka rubuta akan ramin rami, zurfin yana da mita 12,226,) a cikin 1989 kuma shine mafi zurfin ma'anar wucin gadi a Duniya, kamar na Mayu 2019. Ramin rami yana da diamita 23 santimita (9 in). Dangane da zurfin zurfin, shi ne rami mafi zurfi a duniya. Shekaru biyu kuma ita ce rami mafi tsayi a duniya dangane da zurfin da aka auna tare da rijiyar rijiyar, har sai da aka wuce shi a cikin 2008 ta rijiyar mai mai tsawon mita 12,289 (40,318 ft) Al Shaheen a Qatar, kuma a cikin 2011 ta rijiyar mai tsawon mita 12,345 (40,502 ft) Sakhalin-I Odoptu OP-11 (a gabar teku daga tsibirin Sakhalin na Rasha).  Tambaya: Yaushe ne aka fara hakowa?
24 ga watan Mayu 1970