Lot GC 01 includes a 2.4 km long tunnel, a new Métro station in Oullins Centre and the start shaft at Saint-Genis-Laval. The tunnel, approximately 8.5 m in diameter, is excavated with a TBM. From 2023, the tunnel will connect Métro Line B to two new stations, one at Oullins Centre and another at Saint-Genis-Laval/Hôpitaux Sud, which is being built as part of Lot GC 02. The geological conditions are well understood thanks to various test drillings, but tunnelling in an urban environment remains a technical challenge. Implenia is proud to be providing its resources, as well as its experience and expertise in working beneath built-up areas, to this demanding project. Construction is due to start in autumn 2018 and will take about four and a half years to complete.