Going for Broke: Rick and Marty Lagina return to Oak Island and begin preparations for a major excavation in the Money Pit. (S4, ep 1)

Always Forward: Rick and Marty Lagina investigate a mysterious 'Hatch' which may be a secret entrance to an underground treasure tunnel on Oak Island. (S4, ep 2)

Swamp Things: The Lagina brothers find evidence of what could be an ancient shipwreck in the Oak Island swamp. (S4, ep 3)

No Stone Unturned: Rick and Marty Lagina begin their search for a centuries-old treasure vault in the Money Pit. (S4, ep 4)

Bullseye: Rick and Marty Lagina believe they have finally located an ancient treasure vault in the Oak Island Money Pit. (S4, ep 5)

Circle in the Wood: The Laginas decide to move their Money Pit operation in hopes of finding a strange golden object. (S4, ep 6)

All That Glitters: As Rick and Marty Lagina begin a second massive dig in the Money Pit, possible proof of a shipwreck is located in the swamp. (S4, ep 7)

The Mystery of Samuel Ball: The Lagina brothers find important evidence linking an 18th century American slave to the Oak Island mystery. (S4, ep 8)

Echoes From the Deep: Rick and Marty Lagina send divers deep into the Money Pit in search of a mysterious golden object. (S4, ep 9)

About Face: The Oak Island team returns to borehole 10-X in search of new clues. (S4, ep 10)

Presidential Secrets: Rick Lagina travels to the Franklin D. Roosevelt library to find out why the former US President was obsessed with Oak Island. (S4, ep 11)

Hyde Park and Go Seek: Rick and Marty decide to dig a third hole at the Money Pit after Rick finds even more evidence connecting Oak Island to the Knights Templar. (S4, ep 12)

One of Seven: The Laginas and their partners make incredible discoveries at Smith's Cove and in the Money Pit. (S4, ep 13)

Of Sticks and Stones: Rick and Marty Lagina face a major dilemma as they continue their search for the original Oak Island Money Pit. (S4, ep 14)

Blood is Thicker (Part One): The Laginas and their team make what could be the most important discovery in the history of Oak Island. (S4, ep 15)

Blood is Thicker (Part Two): In the season finale, the Lagina brothers wrap up their treasure hunt after making a momentous discovery. (S4, ep 16)