For the last episode, When the Snow Melts, we took an in-depth look into the unsettling mystery often referred to as the Dyatlov Pass Incident.
The incident details the mysterious deaths of nine hikers as they attempted a challenging trek through the Ural Mountains.
In this Extra episode we look at one final theory that might go some way to explaining just what exactly happened on that fateful night of February 1st 1959.
Find out more at www.unexplainedpodcast.com and @unexplainedpod