Dyatlov Pass Incident

It's Soviet Russia, 1959. Nine experienced hikers set out on what's thought to be a rigorous yet doable expedition. But after nearly a month and no word from any of them, their families start to worry. Their worry turns into devastation when the bodies are discovered. However, only half of them were found. Almost 2 months later when the rest of the bodies are recovered is when it starts to get weird. These ones didn't just die from hypothermia. They died from something much more mysterious.