Bleeding from the eyes, foaming at the mouth, and bashing themselves to death against the rocks. That was the fate of six skilled hikers in the Russian mountain range Khamar-Daban – at least according to the single survivor Valentina Utochenko. Yet if the Russian authorities are to be believed, it was just a simple case of hypothermia.

With speculation over what happened still rife, this mystery has been chalked up to everything from secret Novichok testing to accidentally ingested magic mushrooms. We know what we think, but you’ll have to listen to find out.