: - Ft. Redoubt’s dry moat had a bridge, probably a draw bridge, to this entrance. Right: - The moat was drained by a tunnel running a considerable distance to a point in the woods where the land was lower than the bottom of the moat. It terminated in a pipe-like section too small to crawl through. The depicted entrance in one of the rooms lead down to the tunnel, perhaps for maintenance purposes. The room was rather dark, and my camera was placed on a ledge and a long time exposure was made. Several of us crawled to the end of the tunnel and back.