The tunnels are named for the hill through which they pass, near the town of Gosseldange, in the commune of Lintgen.
At its maximum, the tunnel lies 115 metres (377 ft) below the surface of the hill.
The breakthrough ceremony was held on 12 December 2002, with Grand Duke Henri detonating the explosive charge that connected the two ends of the tunnels.
[2] Altogether, the tunnel cost €100m to construct, and 420,000 m³ (14.8m cu ft) of earth were excavated, 65% of which was removed by explosives.
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