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.

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."

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.

Ashlan and Philippe Cousteau head to Roatan, Honduras, to investigate rumors of a lost chest of gold still missing on the island. Their mission combines moments of incredible beauty and harrowing danger as they try to solve the mystery.

Philippe and Ashlan Cousteau go to Amelia Island, Florida, to investigate one of the most famous stories of sunken treasures ever -- the lost 1715 Silver Fleet. New theories of where the treasure is takes them on mission of dramatic twists and turns.

Ashlan and Philippe Cousteau dig into rumors that the so-called "Robin Hood of Pirates" left treasure behind for his friends to find in the Dominican Republic. What they discover at the end of their mission surprises even the local experts.

Philippe and Ashlan Cousteau go to Puerto Plata in the Dominican Republic to unravel a mysterious shipwreck that might have treasure on board. No one knows its name or what it was carrying, so their investigation is going to be very difficult.

Philippe and Ashlan Cousteau go to Dominica, a remote island where a Spanish treasure convoy wrecked with millions in treasure. Their investigation reveals clues about whether the treasure was salvaged by local tribes or remains undiscovered.

Philippe and Ashlan Cousteau travel to Ecuador to investigate the legend of the bloodthirsty pirate Bartholomew Sharpe and his lost treasure. Their mission brings them to a remote island called Isla Del Muerto -- Dead Man's Island.

Philippe and Ashlan Cousteau join a mission off the coast of Key West, Florida, to help prove the identity of a mystery ship that could millions in treasure.

Ashlan and Philippe Cousteau head to Puerto Rico to unlock the mystery of pirate Prince Maurice and his lost ship, The Defiance. Recent hurricanes on the island may have uncovered clues to the whereabouts of the 400-year-old shipwreck.

Philippe and Ashlan Cousteau team up with the Peruvian Navy to investigate a 17th-century disaster that still haunts the country and its people.

Ashlan and Philippe Cousteau head to Bermuda to help solve the mystery the Roanoke, a Civil War-era gun runner that was taken over by pirates. In more than 150 years, no one has been able to find the doomed vessel and its mysterious cargo.

Ashlan and Philippe Cousteau go to South Florida to meet with a family who says they have a map to billions in lost gold. Their investigation could involve the greatest cover-up in US history and ends with a mysterious finding in a swamp.

Philippe and Ashlan Cousteau return to the US Virgin Islands to investigate what happened to the RMS Derwent, a 19th-century paddle wheeler that vanished without a trace. Recent hurricanes have revealed clues to the boat's whereabouts.

The Cousteaus head to the gulf coast of Florida to investigate the legend of the infamous pirate Gasparilla and reports of a local resident who claimed to have sailed with him. The mission is put in jeopardy when Ashlan suffers a serious injury.

Ashlan and Philippe Cousteau head to Pensacola, Florida, to track down a Native American legend of pirates and lost treasure. The investigation becomes a fight for survival when their mission takes them to the dark and dangerous Escambia River.