Lowest point (artificial)
The lowest point underground ever reached was 12,262 metres (40,230 ft) deep (SG-3 at Kola superdeep borehole).
The lowest human-sized point underground is 3.9 kilometres (2.4 mi)[1] below ground at the TauTona Mine, Carletonville, South Africa.
The lowest (from sea level) artificially made point with open sky, might be the Hambach open pit mine, Germany, 293 metres (961 ft) below sea level.
The lowest (from surface) artificially made point with open sky, might be the Bingham Canyon open pit mine, Salt Lake City, United States, 1,200 metres (3,900 ft) below surface level.
The lowest point underwater was the 10,680 metres (35,040 ft)-deep (as measured from the subsea wellhead) oil and gas well drilled on the Tiber Oil Field located in the Gulf of Mexico. The wellhead of this well was an additional 1,259 metres (4,131 ft) underwater for a total distance of 11,939 metres (39,170 ft) as measured from sea level.[2]28.736667°N 88.386944°W
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