Key facts
The Lötschberg base tunnel (LBT) is 34km long and was opened in 2007. Today, only around 40% of its length is dual carriageway. It is planned to make it completely dual carriageway by December 2035. As part of the 2035 expansion phase, Parliament made CHF 2.06 billion available to BLS Netz AG (BSLN) for this purpose.
The Swiss Federal Audit Office (SFAO) audited risk management in the LBT project in 2022 and issued four recommendations. Against this background, the SFAO performed a follow-up audit at BLSN to evaluate the implementation of these four recommendations. All the recommendations have been implemented.