The initial target depth was set at ૧૫,૦૦૦ મીટર (૪૯,૦૦૦ ફીટ). On 6 June 1979, the world depth record held by the Bertha Rogers hole in Washita County, Oklahoma at ૯,૫૮૩ મીટર (૩૧,૪૪૦ ફીટ) was broken. In 1983, the drill passed ૧૨,૦૦૦ મીટર (૩૯,૦૦૦ ફીટ), and drilling was stopped for about a year to celebrate the event. This idle period may have contributed to a break-down on 27 September 1984: after drilling to ૧૨,૦૬૬ મીટર (૩૯,૫૯૦ ફીટ), a ૫,૦૦૦ મીટર (૧૬,૦૦૦ ફીટ) section of drillpipe twisted off and was left in the hole. Drilling was later restarted from ૭,૦૦૦ મીટર (૨૩,૦૦૦ ફીટ). The hole reached ૧૨,૨૬૨ મીટર (૪૦,૨૩૦ ફીટ) in 1989. In that year the hole depth was expected to reach ૧૩,૫૦૦ મીટર (૪૪,૦૦૦ ફીટ) by the end of 1990 and ૧૫,૦૦૦ મીટર (૪૯,૦૦૦ ફીટ) by 1993. However, due to higher than expected temperatures at this depth and location, ૧૮૦°સે. (૩૫૬°ફે) instead of expected ૧૦૦°સે (૨૧૨°ફે), drilling deeper was deemed unfeasible and the drilling was stopped in 1992. With the expected further increase in temperature with increasing depth, drilling to ૧૫,૦૦૦ મીટર (૪૯,૦૦૦ ફીટ) would have meant working at a projected ૩૦૦°સે (૫૭૦°ફે), at which the drill bit would no longer work.

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