Survivor: Panama
Immunity Challenge Each tribe must send three members to paddle out to grab skulls from four coffins sitting at the bottom of the ocean. Each time a coffin is found, someone must dive under water, open the coffin and find a skull puzzle piece. They'll then untie the puzzle piece and bring it back to the boat. Once all four skull puzzle pieces have been gathered, they will bring  them to shore. The two tribe members left use those four puzzle pieces to build a skull pyramid. The first tribe to build their skull pyramid and put their gold skull on top wins Immunity.