Explorer Sam Cossman uploaded this crazy video to Youtube showing his expedition to the bottom of the Marum Crater. An active and very dangerous volcano located in the Republic of Vanuatu, in the South Pacific Ocean. Hands down one of the most terrifying videos we’ve seen. Here’s the explanation behind the video and dangerous journey: Sam Cossman and George Kourounis guided by volcanic pioneers Geoff Mackely and Brad Ambrose become among the first explorers to step foot inside the worlds most dangerous and inaccessible volcano, Marum Crater. More people have visited the moon than the firey bottom of this spectacular and deadly place.