There is no known map for Map Point G. However, the point itself may be highly significant in that its location coincides with a well-known feature of Oak Island, the Cave-In Pit.
In a letter to Rupert Furneaux, Gilbert Hedden reported that the original Cave-In Pit lay 20 feet south of the point that Charles Roper identified at seven rods from the East Rock on a line to the West Rock. The Pit was found to be about 18 feet deep (5.5m) and 8 feet wide. It follows that, at this width, the centre of the original Cave-In Pit would thus lie at Map Point G.
It would seem highly likely, therefore, that somebody dug a deep and well-defined pit at one of the map points located on the extended rhombus. This would raise the question of why. One thought might be that the digger believed there to be something deposited at that spot and not necessarily a treasure. It may have been something that was needed in order to locate it. The originator may even have dug the pit himself as a place of temporary deposit.
However, the fact of the hole being where it is may serve to emphasise that the instructions are not simply random values completely independent of known features of the island. However, it may not be that anyone needed to dig at the seven points identified as they may be drawing attention to a single point perhaps at the centre of the figure, as below.
An article by Josephine Fredea in 1906 recounts a tale of a man finding a chest containing information concerning a treasure buried on an island in Nova Scotia reporting the deposit of several packages. Perhaps, this might be a reference to several locations such as the map points.
It might also be considered just where these seven points are located in the context of Oak Island discoveries. Reports suggest that the east of the island is riddled with man-made tunnels. Rupert Furneaux discussed such passageways with Edwin Hamilton and reports the following:
“Descending through a shaft near Smith’s Cove, Hamilton crawled along a tunnel which curved gradually, and divided, ‘going both sides’ of the Cave-In Shaft. Below this tunnel, he found another, and deeper still, yet another tunnel. This deeper tunnel lay in perfect line above the flood tunnel.”
Hamilton sank a shaft eleven feet deep in the floor of this third tunnel finding sand, beach gravel, small stones and blue clay but no water. About six feet down he unearthed a flat stone, not native to that level, and alongside it, several pieces of chewing leaf tobacco in good state of preservation, apparently, left by the old diggers. At ten feet he came across bits of wood and twigs which gave, “the appearance of an old trench dug from the top down to flood the Money Pit” more than 300 feet to the west.
The tunnelling is also confirmed by Simon J. Goodman another keen researcher of the Oak Island mystery. In correspondence with Furneaux, Goodman observed:
“There is also three to four thousand feet of underground passageways on Chappell property. These are all man-made. In one location, as indicated, I followed the passageway . . . and, stopping to take a picture, my feet settled into the ground about four inches. This was not infilling and I easily pushed a branch of a small tree about three feet into the ground without any trouble.”
Goodman commented that, over the years, water had seeped into the tunnel and it had started to cave in. When it rained, water could be seen gushing through the entrance into the passageway. He concluded:
“The reason these locations have not been noticed is because huge stones are placed on top of them and, if the ground settles, the stones settle . . . and in that way nothing seems out of place.”
Furneaux concluded that it is unlikely that all these passageways were searcher tunnels.
These reported tunnels are in the area covered by the map points. Had they been original then it might have been possible and fairly easy to employ them to access a location underground directly beneath the map points or the centre of the figure.
