Semyon Dyatlov was a Soviet engineer and the leader of the Dyatlov Pass expedition in 1959. He and nine other hikers tragically died under mysterious circumstances in the Ural Mountains of the Soviet Union. The incident has since become a subject of intrigue and speculation, leading to various theories about what happened. The group, known as the Dyatlov Group, set out for a skiing expedition but never returned. Their bodies were discovered months later, with some showing unusual injuries and signs of distress. The case remains unsolved, contributing to the enduring mystery surrounding the Dyatlov Pass incident.