gamma     Sun, Jun 6, 2010  Permanent link
Its the power of the pyramids.
nagash     Wed, Jun 9, 2010  Permanent link
the peninsula of Yucatan have an amazing complex of underground rivers. this is unique on Earth, and it's what sustained their rain-forests for millenia. there are several "holes" like this one, and the Mayans called they the "entrances" to the underworld - they believed that, when you die, you had to travel your way through these caves to Xibalba.

there's a great documentary about the first divers who dared to explore those underground rivers, as they try to map and understand it. I really recommend watching it in hi-resolution (the images are breath-taking), but if you want to take a look, it's available on youtube...

on this documentary, the divers alert about the dangers of building a city above these underground rivers, both to secure human lives and to preserve this wonder of nature. too bad people don't listen...
gamma     Thu, Jun 10, 2010  Permanent link
The power of the Xibalba tunnels!
gamma     Thu, Jun 10, 2010  Permanent link
There are actually, many deep blue holes around the gulf of Mexico, i.e. the Caribbean circle.
nagash     Fri, Jun 11, 2010  Permanent link
more sinkholes...