1. Sinkhole in Guatemala
2. Glory Hole - Monticello Dam, California
3. Bingham Canyon Mine, Utah
4. Great Blue Hole , Belize
5. Mirny Diamond Mine , Serbia
6. Diavik Mine, Canada
7. Kimberley Big Hole - South Africa
3. Bingham Canyon Mine, Utah
4. Great Blue Hole , Belize
5. Mirny Diamond Mine , Serbia
6. Diavik Mine, Canada
7. Kimberley Big Hole - South Africa
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