Group of archeologists captured on treasure hunt VIII

The prisoners are taken as hostages by the three scull brothers. After a while, the weakened captives can not any longer carry their burden. To punish them, they are stripped and and bound. A native girl heads to the nearby village for help. Her brother sees, how the helpless captives are fondled and molested by the villains. He tries to fight the villains with his slingshot. They follow him, but he escapes and joins the rescue party. The villains decide to head off. Soon the captives are discovered and freed by the village people and a female police officer.