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Gavin Grimmer
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This means that as the tunnel is between 95 to 100 ft long (measured on GE) that there is a total rise from 60 ft to 69 ft over the length of it (1 in 11). Allowing for the height of the tunnel being at a guess of 7 ft (?), this means that at the position of the Placemark at the top of the tunnel, the ceiling of the tunnel will be 5 ft down from the surface as the height of the ground at that point is 54 ft ASL.

I would say that the "60 ft" tunnel entrance position on the map is only a generalization as according to GE it is 54 ft, but if you go a few feet horizontally either side of that point(according to GE) it does get up to 60 ft which kind of indicates that there is a bit of a hollow in the hill side there - Maybe due to the surrounding dirt being shoveled into the tunnel entrance?

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NH Page 10

Possible Entrance shown in  NZAM aerial photo 1973