If the Smiths cove dam was to stop water from leaking inland into the flood tunnels beneath Oak Island, then there must be a similar shaft tunnel in the Birch Island triangle, in the inscriptions on the money pit stone found at the 90-foot level distinctly point to the right angle of a triangle. The Birch Island triangles right angle has a similar artificial beach as to the Smiths Cove Beach area; if these two-beach areas are built by the same original builders then they were built for the same purposes. There is visual evidence that shows that there was an ancient flood dam built around the right angle of the Birch Island triangle.

Since these two beach areas are similar, then flood tunnels run the same depth to the 100-feet level under the Islands, we know this because by the excavations of the Money pit. So what’s ever is in the Birch Island triangle probably goes to the100 ft depth and it has surface shafts inland that more than likely surfaces out of the triangle..... http://www.canadaka.net/blog/oakster