My frustration with this show is that even if no significant buried treasure exists, you'd hope that at least something of interest would be found with all the digging. However, after 150 years of treasure hunters and excavations going down over 100 ft, the island has been completely picked clean. I basically have to sit there for an hour just to see a railroad spike found in the swamp. Heck, I bet that thing has been found several times by various treasure hunters and just tossed back into the swamp since it has no significance.
Going back to my frustration, I bet if the brothers picked any other island in the vicinity and dug 150 ft deep, they'd probably find something of more interest, since at least these areas haven't been inspected to the 10th degree by multiple people. Heck, I bet if they dug just 10 ft deep in a neighboring island, they'd have a better chance of finding old pirate loot than on Oak Island.