Anonymous ID: d0e532 May 30, 2023, 7:06 p.m. No.18927735   🗄️.is 🔗kun   >>7786

>>18927628

Drilling began on 24 May 1970 using the Uralmash-4E, and later the Uralmash-15000 series drilling rig, and it became the deepest manmade hole in history in 1979. The 23 centimetres (9 in) diameter boreholes were drilled by branching from a central hole.[1] The deepest reached 12,262 metres (40,230 ft; 7.619 mi) in 1989, the deepest human-made hole on Earth, and remains so as of 2023.