In 1897 members of The Oak Island treasure company attempted to use dynamite and blow up the flood tunnels to help find the treasure.
During episode 3 of season 7 The Curse of Oak Island team discovered one of the spots where the former treasure hunters worked.
This means the team might be close to finding the original flood tunnel. This could help the team discover the money pit.
In the preview for episode 4 which is scheduled to air next Tuesday the team discovered “wood” at a very deep depth roughly close to the 95+ feet under ground. Also metal detector Gary Drayton can be seen finding a very cool artifact.