This is a long read taken from The Red Bulletin. Listen to 6 stories from the underground astronauts, aka terranauts, exploring worlds beneath the surface of the earth. From microbiologists using caving to research antibiotic resistance, hanging out in caves so big they have their own weather systems, to urban explorers who traverse enormous sewer systems, battling the authorities, tidal surges and deadly infections in their quest. Then there are the paleoclimatologists researching climate change and rising sea levels in the massive ice shafts that most mountaineers spend their lives trying to avoid. Take a dive into the underworld. This article was taken from The Red Bulletin. Written by Mark Bailey. Read more at www.theredbulletin.com. Listen to all episodes and discover more about Beyond the Ordinary at www.redbull.com/beyondtheordinary