Could a newly discovered underwater marker be the biggest breakthrough yet in the search for the Oak Island treasure? In this full episode of The Curse of Oak Island, Rick and Marty Lagina investigate a mysterious triangle-shaped stone, search for evidence of a long-lost shipwreck, and uncover what appears to be a five-foot underground void beneath hard slate. Using advanced side-scan sonar, drilling equipment, and underwater mapping technology, the team follows new clues that could connect the swamp, the Money Pit, and centuries-old treasure legends. Join the Fellowship of the Dig as they explore hidden tunnels, submerged anomalies, possible man-made structures, and one of history's greatest unsolved mysteries. #CurseOfOakIsland #OakIsland #HistoryChannel #TreasureHunt #MoneyPit #Shipwreck #Archaeology #NovaScotia #SideScanSonar #Mystery" Subscribe for more from The Curse of Oak Island and other great The HISTORY Channel shows: http://histv.co/SubscribeHistoryYT Find out more about the series and watch full episodes on our site: https://histv.co/OakIsland Check out exclusive The HISTORY Channel content: History Newsletter - https://histv.co/newsletter Website - https://histv.co/History Facebook - https://histv.co/Facebook Instagram - https://www.instagram.com/history TikTok - https://www.tiktok.com/@history "The Curse of Oak Island" follows brothers Marty and Rick Lagina as they investigate the mystery of a buried treasure on Oak Island off the coast of Nova Scotia, Canada. The HISTORY® Channel, a division of A+E Global Media, is the premier destination for historical storytelling. From best-in-class documentary events, to a signature slate of industry leading nonfiction series and premium fact-based scripted programming, The HISTORY® Channel serves as the most trustworthy source of informational entertainment in media. The HISTORY® channel has been named the #1 U.S. TV network in buzz for seven consecutive years by YouGov BrandIndex, and a top favorite TV network by Beta Research Corporation. For a deeper dive, visit history.com or follow @history on Instagram, Twitter, Facebook, YouTube and TikTok.