The Curse of Oak Island Season 12, Episode 16 recap: Sunken treasure theory and a debate about an ancient nail

For over a decade, The Curse of Oak Island team has been on a quest to uncover what lies beneath the island’s mysterious landscape.

No matter how small, each new discovery fuels fresh speculation and ambitious excavation plans. However, fans of the series remain frustrated as the team has yet to produce any real treasure.

In Season 12, Episode 16, Open Sesame, the search continues with promising finds that could rewrite Oak Island’s history.

A brick fragment, wooden stakes, and a single nail spark heated debates and wild theories.

The team’s latest theory suggests that multiple treasure deposits have sunk deep into underground channels.

With a caisson now in place, they hope this excavation will finally unearth the answers they’ve been chasing.

A brick, a Swamp, and a bold theory

The episode begins on Lot 5, where Jack Begley discovers what appears to be a brick fragment.

Though an unremarkable find at first glance, lab analysis reveals that it closely resembles other Canadian bricks found on the island.

This leads to a controversial conclusion. Anthony Graves, a historical Oak Island figure, may have hidden Spanish coins in the swamp vault.

Meanwhile, Jack joins the search in the swamp, where survey stakes, rocks, and a mysterious metal object emerge.

These discoveries prompt yet another War Room meeting, a crucial step in deciphering Oak Island’s riddles.

The discussion soon shifts to a striking new theory: multiple treasure deposits in the Money Pit may have sunk over 200 feet into the solution channel, making retrieval even more challenging.

Aladdin’s Cave and the 18th-century nail

Determined to prove their latest hypothesis, the team shifts focus to Aladdin’s Cave, a Money Pit section that was explored earlier by the Oak Island team with no major results.

This time, excavation uncovers wood believed to be from a tunnel, hinting at possible human activity from centuries past.

Among the finds, Gary Drayton pulls up an aged nail, which prompts another round of testing.