The Mont d'Ambin base tunnel (also known as the Mont Cenis base tunnel) is the largest engineering work of the Lyon–Turin rail link project. Reconnaissance work began on the French side in 2002 with the excavation of access points at Modane, then Saint Martin la Porte (2003) and La Praz (2005), and on the Italian side in 2011 at La Maddalena. Construction has yet to start officially, but the 9 km reconnaissance gallery that is being tunneled from Saint Martin de la Porte towards Italy is bored along the axis of the South tube of the tunnel and at its final diameter.
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