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