Egypt's ultimate secrets could be hidden underwater. A cutting edge archaeological investigation uses high-tech methods to scan the ocean floor in search of sunken sphinxes, temples and shipwrecks.

Cutting-edge archaeology investigates the mysterious seas and rivers that are home to ancient Egypt's greatest relics; special access to new, groundbreaking research reveals the secrets of long-lost treasures hidden by water and time. This is a mashup of S07E08 "Egypt's Sunken Treasures" and S05E04 "Curse of the Seventh Wonder."