This incredible geographical phenomenon known as a
blue hole is situated 60 miles off the mainland of Belize ..
There are numerous blue holes around the world,
but none as stunning as this one.









This is supposedly the largest man-made excavation on earth. Extraction began in 1863 and still continues today, the pit increasing in size constantly. In its current state the hole is ? miles deep and 2.5 miles wide.






















The mine is so huge and the area so remote that it has
its own airport with a runway large enough to accommodate a Boeing 737.
It looks equally cool when the surrounding water is frozen.












These photos are of a sinkhole that occurred
early this year in Guatemala . The hole swallowed
a dozen homes and killed at least 3 people.






I'm pretty sure most people have seen this one.
It's an absolute beast and holds the title of largest
open diamond mines in the world. At 525 meters
deep, with a top diameter of 1200 meters, there's
even a no-fly zone above the hole due to a few
helicopters having been sucked in.







Apparently the largest ever hand-dug excavation in the world,
this 1097 meter deep mine yielded over 3 tons of diamonds
before being closed in 1914.