Jonathan Bird's Blue World - Season 4 Season 5 Episode 5 Mayan Underworld (Yucatan, Mexico)

Deep in the heart of Mexico's Yucatan, Jonathan is exploring remote cenotes in the jungle that were once used for Mayan rituals. Just reaching the surface of the water requires rappelling down from the forest above. But then, beneath the surface, he encounters strange alien life forms that live in total darkness, and the remains of humans and animal sacrifices from an ancient culture.