RCAHMS NMRS record no. HY21NE 9 bears out my comparisons as they have a two-foot gap at the top leading down to a 1.5m high beehive cell that is equated with the well at the Broch of Gurness. And over the fence t’other side o’ road is described a curving subterranean passage 800x800mm and at least 2.5m long (souterrain but not a souterrain?).
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