Ancient civilizations buried underwater for centuries hold answers to a mysterious and unexplained past; using cutting-edge archaeological methods and pioneering radar technology, experts investigate these sunken empires and the secrets of their remains. This is a mashup of S08E07 "Secrets of the Sunken Empire" (Pavlopetri) and S07E08 "Egypt's Sunken Treasures." 

Curiously constructed pyramids of ancient Egypt contain mysteries that continue to baffle archaeologists today; using the latest imaging technology and advanced scientific methods, experts decode the secrets behind these strange and unexplored ruins. This is a mashup of S08E08 "Egypt's Floating Pyramid" (Pyramid of Lahun) and S07E03 "Secrets of the Black Pyramid."