The Curse of Oak Island: Evidence of a Large Underground Treasure Chamber (Season 6)

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A sonar scan of the H-8 shaft reveals evidence of a rather large cavity some 170 feet underground in this clip from Season 6, Episode 12, "Slipway When Wet", #OakIsland
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"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.

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