In the 1960s, a French plane crashed in the desert of Algeria in North Africa. Except for one person, the whereabouts of all the other crew members were unknown. The exhausted survivor brought back a mysterious suitcase, but his consciousness was dazed and no one could tell what had happened from him. In order to find the crashed plane and find out the cause, the military sent a team of 10 paratroopers to the desert to search. After going through untold hardships, the paratroopers finally found the wreckage of the plane, but were soon attacked by guerrillas and encountered a strong sandstorm at the same time. Natural disasters and man-made disasters made these young people from France completely lose their way. They accidentally walked into a mud city that had never been marked on the map, and thus began a strange and terrifying experience...