Peril strikes during a risky dive as brothers Rick and Marty Lagina double down on their efforts to locate the original Money Pit with the most ambitious engineering operation in Oak Island history. The fellowship of the dig is faced with a tragic loss of one of their own.

Evidence of pirates once being on Oak Island mounts when a treasure chest from the 1700's is found. The brothers get a stunning news about a find from theMoney Pit's GAL-1 shaft.

New evidence of a European presence on Oak Island more than a century before the discovery of the Money Pit exhilarates the team. Later the team hears some alarming news that threatens to shut down the entire operation.

Danger strikes as the geo-tech drilling team hits a possible void in the Money Pit. With the discovery of a long lost artifact leads to an emotional reunion for one of the surviving members of the legendary Restall family.

The discovery of an old document gives new clues on the exact location of the Money Pit. The fellowship of the dig makes a cryptic discovery at uncharted depths.

After years of searching and speculation, Rick and Marty Lagina and their team unearth evidence of what Marty believes is the exact location of the ultimate target, the Money Pit.

A theory is presented that Sir Francis Drake is buried on Oak Island in a vault with gold treasure. It is suggested that the lack of any records documenting Drake traveling to Canada is proof that he must have traveled to Canada

New evidence confirms a European presence on Oak Island 100 years before the discovery of the Money Pit; research suggests a clear pathway from the Knights Templar to Oak Island.

A research expedition to a French castle and prison reveals new clues, including ancient carvings that strengthen a possible link between the Knights Templar and Oak Island.

The team unearths a ship's log detailing the burial of treasure on an island similar to Oak Island. Later, Rick and Gary make what may prove to be the biggest find on Oak Island.

Further investigation suggests a link between the mysterious medieval cross and the Knights Templar.

A skeleton key and maps from Fred Nolan's archives open a new door in the Lagina's quest, while new evidence suggests a Templar connection to the lead cross found in Smith's Cove.

The plot thickens around the discovery of the lead cross as a new theory points to possible ancient origins, while Rick pulls an artifact from the swamp that may support one of Fred Nolan's theories.

The discovery of the mysterious lead cross raises new questions about a Knights Templar connection; a look at Templar history and the compelling Templar clues the team has found so far.

The team hits something in the DMT shaft that may prove to be the last thing standing between it and the answers below; Gary Drayton strikes again when he zeros in on a find that could be a key piece of a missing treasure chest.

With little time before the team must suspend operations for the harsh winter ahead, the fellowship battles the shifting tides of Smith's Cove, and finds evidence that may support one of Dan Blankenship's early theories.

The Oak Island mystery has lured generations of treasure hunters; the families that have been a part of Oak Island's history for more than two centuries.

In the season finale, it's the moment of truth for the fellowship of the dig, as the guys are faced with the dilemma of whether to quit or continue their quest.