I find this fascinating! Googling a bit, it seems there is a documentary on the Movile cave: http://www.dailymotion.com/video/x1qpffb_the-secret-underworld-movi

I find this fascinating! Googling a bit, it seems there is a documentary on the Movile cave: http://www.dailymotion.com/video/x1qpffb_the-secret-underworld-movile-sulphur-cave-life-romania-national-geographic-adventures_tech http://www.dailymotion.com/video/x1qpffb_the-secret-underwor...