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."

The seven engineering marvels that are regarded as the modern wonders of America set the benchmark for structural innovation, and now investigators use hidden records to decode and reveal the mysteries behind these historic American icons.