Quote Originally Posted by bobo746 View Post
Quote Originally Posted by Bettyboo
but until this question is answered:
I dont know the answer mate whats the biggest man made hole.
Arguably Kimberly Mine, South Africa which was mined to 3,600 feet. Today though its only 705 feet deep. The mine in the picture (Mirny) is 1,722 feet deep.

25 Most Massive Man-made and Natural Holes - WebEcoist