Here's a photo gallery of large natural and man-made holes in the ground. There are mines, a reservoir drain, and a sinkhole, such as this 330-foot deep sinkhole that killed three people this year in Guatemala when a sewer line broke.
http://www.slightlywarped.com/crapfacto ... gholes.htm
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Holes in the ground
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Holes in the ground
by Wayne Harrison » Sep 25, 2007 12:25 pm
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Wayne Harrison - NSS Hall Of Fame Poster
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Cavechat is the official caving forum of the National Speleological Society.
The NSS is not responsible for the opinions expressed, and cannot verify the accuracy of information presented.