The beautiful Island paradise of The Bahamas are home to some of nature's most amazing cave systems. Blue Holes, seen below in this National Geographic documentary, are formed when ice causes cavities in rock which extend deep into the ground. Their water is added when the sea level rises once the ice has melted, and then a layer of fresh water forms as a plaster on the salty contents. Once this double layer of water types is established, an oxygen free environment is created. The effects of this unusual water is that anything which falls in is preserved.
Divers regularly risk their lives to explore these miraculous time capsules, one such cave is home to a stark reminder shown from this still of the documentary.
Discovered by Christopher Columbus, and native to a human culture called the Lucayans, little is known about the history of this land until the modern day. The blue hole caves have been explored to find evidence of this mysterious Lucayan people and if their presence was connected to the massive extinction of species on these sun shine islands. An archaeologist's and a diver's dream destination, the work of cataloguing each find must have been a true pleasure.
Watch the documentary in the video and see for yourself how exciting this kind of expedition and study can be.