A speleologist returns to his country after twenty years, organizing an expedition of speleologists and former military personnel with the purpose of hiding or destroying something they found in a cave many years before, to prevent it from falling into the hands of the government. To do this, they need to smuggle in weapons and explosives. Amidst historical and political nuances, the action unfolds. They find military caves with secret contents. Once the operation is completed, they need to leave the area to avoid being captured. Tension heightens as they try to escape by sea, finding themselves in the middle of battles with government military forces.