After a decade of searching, Rick, Marty, and the team return to Oak Island and immediately uncover evidence of a mysterious tunnel in the Money Pit. And for the first time ever, the Fellowship gets a clear look at an underground structure, getting them closer than ever to solving the 227-year-old mystery.

Armed with more evidence that the garden shaft, where high levels of gold have been detected in the water, is connected to a possible series of tunnels in the Money Pit, the team begins the arduous work necessary to get a team member underground.