HISTORY | 9:00 pm
Michigan brothers Rick and Marty Lagina have learned by now that Oak Island isn't going to give up its secrets willingly, with each discovery they and their team make yielding new questions instead of answers. In the new episode "Seaing Is Believing," that definitely applies to the tantalizing discovery of a stone roadway under the muck of the swamp. The underwater road clearly expands as it continues its course … to where? Hoping for some answers, the team heads to sea to determine how far the road extends.