![]() ![]() In that year, the hole depth was expected to reach 13,500 metres (44,300 ft) by the end of 1990 and 15,000 metres (49,000 ft) by 1993. Drilling was restarted in September 1986 from 7,000 metres (23,000 ft) from the first hole. This idle period may have contributed to a breakdown after drilling resumed on 27 September 1984, after drilling to 12,066 metres (39,587 ft), a 5,000-millimetre (200 in) section of the drill string twisted off and was left in the hole. In 1983, the drill passed 12,000 metres (39,000 ft) in the second hole, and drilling was stopped for about a year for numerous scientific and celebratory visits to the site. In October 1982, the first hole reached 11,662 metres (38,261 ft), and the second hole was started in January 1983 from a 9,300-metre (30,500 ft) depth of the first hole. ![]() On 6 June 1979, the world depth record held by the Bertha Rogers hole in Washita County, Oklahoma, United States, at 9,583 meters (31,440 ft), was broken. In 1974, the new purpose-built Uralmash-15000 drilling rig was installed onsite, named after the new target depth was set at 15,000 metres (49,000 ft). The rig was slightly modified to be able to reach a 7,000-meter (23,000 ft) depth. SG PROJECT 5 SERIALKola Superdeep Borehole, commemorated on a 1987 USSR stampĭrilling began on using the Uralmash-4E, a serial drilling rig used for drilling oil wells. For two decades, it was also the world's longest borehole in terms of measured depth along the well bore until it was surpassed in 2008 by the 12,289-metre-long (40,318 ft) Al Shaheen Oil Well in Qatar. In terms of true vertical depth, it is the deepest borehole in the world. The deepest reached 12,262 metres (40,230 ft 7.619 mi) in 1989, the deepest artificial point on Earth. The 23-centimetre (9 in) diameter boreholes were drilled by branching from a central hole. SG PROJECT 5 SERIESThe project attempted to drill as deeply as possible into the Earth's crust.ĭrilling began on using the Uralmash-4E, and later the Uralmash-15000 series drilling rig, and it became the deepest manmade hole in history in 1979. The Kola Superdeep Borehole ( Russian: Кольская сверхглубокая скважина, romanized: Kol'skaya sverkhglubokaya skvazhina) SG-3 is the result of a scientific drilling project of the Soviet Union in the Pechengsky District, near the Russian border with Norway, on the Kola Peninsula. ![]()
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