guy 157 Report post Posted May 10, 2021 (edited) Quote A cave ancient Romans believed to be a gate to the underworld was so deadly that it killed all animals who entered its proximity, while not harming the human priests who led them. Millennia later, scientists believe they have figured out why - a concentrated cloud of carbon dioxide that suffocated those who breathed it. https://www.sciencealert.com/ancient-roman-gate-to-hell-killed-victims-with-its-deadly-lake Edited October 14, 2021 by guy Share this post Link to post Share on other sites