Undersea explorer Barry Clifford believes that a “yellow brick road” may lead to pirate treasure in the waters off Cape Cod, The Associated Press reports.

According to Whydah.com, the pirate ship Whydah was wrecked in a storm off Cape Cod in 1717. Whydah is the only pirate shipwreck ever discovered, and her multitude of treasures continue to be archaeologically retrieved. Whydah.com notes that Clifford and his colleagues have recovered sixty cannon, over ten thousand coins and 400 pieces of Akan gold jewelry.

Although Clifford found the wreck site in 1984 off Wellfleet and his since recovered hundreds-of-thousands of artifacts, Clifford and his divers found out recently that a lot more treasure may have sunk to the ocean floor with the Whydah in 1717.

According to The AP, Colonial-era documents found in April revealed that the Whydah recovered treasure from two ships in the weeks before it met its untimely death. The recently-recovered records indicate that the Whydah would have taken on 400,000 coins after defeating the ships.

The AP reports that Clifford and his team discovered proof that he was in close proximity to those coins during a September 1 dive. They returned again approximately a week later and searched the “yellow brick road,” which is a path filled with treasure between two locations at the Whydah wreck.

Divers reportedly discovered several concretions, which are rocky masses that can develop when gold and silver react to seawater. X-rays reveal that the concretions contain treasure, adding to a growing body of evidence that there is a lot of treasure yet discovered.

According to Whydah.com, the Whydah was captained by pirate Sam Bellamy. Legend has it that Bellamy was on his way back to his lady, Maria Hallett, which his ship ran into an extremely powerful storm. Only two men of 146 survived the wreck.

How much treasure is hidden in the waters off Cape Cod? Share your thoughts in the comments section.