Deepest water bore
Stensvad Water Well 11-W1
United States ()
The world's deepest water bore is the Stensvad Water Well 11-W1 of 2,231 m (7,320 ft) drilled by the Great Northern Drilling Co. Inc. in Rosebud County, Montana, USA in October-November 1961. The Thermal Power Co. geothermal steam well begun in Sonoma County, California, USA in 1955 is down to 2,752 m (9,029 ft).