Into the Deep

The Garden Shaft reaches 95 feet and the team begins horizontal drilling toward the tunnel, only to be met by saltwater flooding at nearly 500 gallons per minute, a problem that echoes the flood tunnel defenses that have defeated searchers for over two centuries. Despite injecting urethane and Geofoam, the water cannot be stopped, and the horizontal program is abandoned. Hurricane Lee adds further setbacks, flooding the swamp and delaying operations across the island. The team pivots to a borehole program targeting the Baby Blob at depths of 80 to 120 feet, while in the swamp, excavation uncovers wooden structures with dowel construction, axe-cut stumps, and a stone walkway leading to formations that may connect to Fred Nolan's long-suspected dam. The season also launches the most ambitious European research campaign in the show's history. In Italy, Rick, Doug, Alex, Peter, and Emiliano Sacchetti tour Morimondo Abbey and Bianzano Castle, where Professor Adriano Gaspani demonstrates that both sites encode the same stellar alignments as Nolan's Cross. In the Netherlands, Corjan Mol leads the team through the Caestert stone quarry and Valkenburg Castle, where 14th-century Templar inscriptions and four-dot crosses match symbols found on Oak Island. The trail continues to Denmark, where sites on Bornholm and the Ladby Viking Museum strengthen the Norse-Templar connection, and to Iceland, where manuscripts at the Arni Magnusson Institute reference the star Arcturus and a cave carving mirrors the lead cross from Smith's Cove. The season ends with the treasure still defended by water, but with a web of medieval evidence stretching from the Mediterranean to the North Atlantic.