Explore the Afterlife

In 1981, when a four-member geological exploration team was conducting geological exploration and scientific research in the Gobi Desert in the southeastern part of the Taklimakan Desert, three of the team members disappeared mysteriously, and only one team member survived. More than twenty years later, the surviving team member organized a team to find the truth about the three missing teammates. During the search, they discovered the "Qiemo Ancient Country", "Craniotomized Corpses" and "Immortal Man". Are these strange things related to the missing scientific researchers that year?