The Lonesome Cave

In Romania, they found a cave that has not been exposed to the outside world for over 5 million years. Evolution there is different than what occurred on the rest of earth. The cave is crowded with insects and the ecosystem is fragile, few are allowed in to see.

"The few who have ventured into Movile Cave have discovered it’s crawling with life — literally. The residents of Movile Cave are not concerned with the high levels of carbon dioxide and hydrogen sulphide in the air. With just half the usual concentration of oxygen, human visitors need breathing equipment to survive. The cave gets more crowded with insects the worse the air gets.
