Philippe and Ashlan Cousteau head to St. Thomas to learn more about Jean Hamlin, a sadistic pirate who may have left a vast fortune on the sea floor. Their investigation uncovers a secret society of divers who lead them to a shocking discovery.

Philippe and Ashlan Cousteau visit Belize to explore the Great Blue Hole, a stunning wonder of the world. They then head to a private island to investigate a modern-day treasure map that could reveal hidden clues to the area's pirate past.

Ashlan and Philippe Cousteau arrive in Antigua to track down new rumors about pirate Prince Rupert's missing treasure. They follow their investigation across the island into dangerous waters that reveal a clue that may change history.

Ashlan and Philippe Cousteau join with local experts in the hunt for clues about a missing treasure from 1554 on South Padre Island, Texas. Their mission takes them from dangerous waters to lethal quicksand in search of answers.

Philippe and Ashlan Cousteau journey to one of the world's deadliest reefs to complete a mission that Philippe's grandfather could not. The expedition brings them face-to-face with danger, disaster and ultimately redemption.

Ashlan and Philippe Cousteau arrive in St. Croix to investigate the scenic island's rich pirate history and its link to the lost treasure of a infamous pirate known as "The Buzzard."

Philippe and Ashlan Cousteau uncover new leads in the search for pirate Calico Jack's missing treasure that could be worth $250 million. Their mission reaches a stunning climax during their high-risk scuba dive beneath waves.

Ashlan and Philippe Cousteau head to the British Virgin Islands to investigate the true story behind Robert Louis Stevenson's famous novel. Their dangerous mission uncovers clues on land and beneath the waves that could impact history.