Somewhere deep below germany

http://www.blauhoehle.com/www/index.php?option=com_content&view=article&id=57&Itemid=71

http://www.blauhoehle.com/www/

http://www.agw.kit.edu/english/blauhoele_cave.php

http://www.showcaves.com/english/de/springs/Blautopf.html

http://archaeology.about.com/od/upperpaleolithic/ss/hohle_fels.htm

https://www.facebook.com/photo.php?fbid=503826639678385&set=a.352867368107647.80532.352857924775258&type=3&theater

There are more scientific minds than mine that can explain this better (hence the multitude of links provided) but it does make me wonder about all the undiscovered pockets of air beneath the surface and what they hold. From what I can gather, until 2010, this one (the Blauhoele) was originally only accessible by diving through an underwater cave at the bottom of a spring called the Blautopf, named for its intensely blue water. There are species living down there that are 300 million years old.
This planet is such a mind-bending place.