New Discovery: Blood-Red Worms That Thrive in a Toxic Cave (EXCLUSIVE VIDEO) | National Geographic 

June 3, 2016 - It's wet, muddy, slimy, and smells like rotten eggs: Sulfur Cave in Steamboat Springs, Colorado, is full of gases so toxic that a person who enters would pass out after just a few breaths. But that didn't stop David Steinmann of the Denver Museum of Nature & Science. Donning a special respirator,