"So Atkinson tunnelled right through the primary mound?"
Almost, I think. About a metre further than Merewether.
It would be better if the section showed both tunnels, plus the voids that have developed above them, both previously known and newly discovered, plus a plan view of the tunnels and their side shoots. it all looks rather simple at present.
The previous diagrams showed those features and contain the vague but concerning statement "Other voids potentially exist along the length of the 1968/69 tunnel" and it is these that are of particular interest to anyone that has a right to be interested. Questions like.... yes, well are there? Approximately how many additional cubic metres? Any chance of photographs?
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