n this episode, archaeologists begin a pioneering experiment to build a replica Aztec pyramid, investigate the mysterious pyramid ruins being unearthed in the heart of Mexico city and venture deep inside a set of hidden tunnels below a vast pyramid that had been lost for centuries.

n this episode, archaeologists investigate the extraordinary discovery of over 100 ancient skeletons buried in a hillside outside Mexico city, attempt to decode the secrets of a mysterious ancient manuscript to reveal the secrets of Aztec ritual sacrifice, and finally manage to complete their ground breaking experiment to build a replica Aztec pyramid.