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\label{fig:Profile80} Profile of the ground level altitude on top of the 80-km tunnel. The possible shaft locations are numbered from 1 to 8. In red is shown a 30-km by-pass tunnel, needed to avoid digging the very deep shafts 4 and 5. This It is possible that this  problemwould  disappear with the 100-km version of the tunnel. (A complete study remains to be done in this case.)