On 6 June 1979 , the world depth record held by the Bertha Rogers hole in Washita County , Oklahoma , United States , at 9,583 m ( 31,440 ft ) was broken .
The machines broke the earlier record for the deepest hole-held by the 9,583-meter ( 31,440 ft ) Bertha Rogers hole in Washita County , Oklahoma , in the United States-on June 6 , 1979 .