The Austrian section of the Transalpine Oil Pipeline runs through three pipeline tunnels each around seven kilometres in length. As is the case with the entire oil pipeline, the Hahnenkamm tunnels near Kitzbühel have been in operation since 1967. To make these pipeline tunnels fit for the coming decades, TAL launched an extensive renovation project in October 2018 and successfully completed this in April 2021. Among other aspects, this included renovating the tunnel walls and arches in order to continue ensuring the reliable operation of the pipeline and the safety of personnel in the tunnels in the years to come. A further key focus area of the work was on the complex renovation of the tracks along which the battery-operated underground locomotive operates. In addition, more than 4,000 metres of new irrigation pipes were laid to drain the tunnels.

The project was implemented while the TAL pipeline was in full operation. The COVID-19 pandemic represented a particular challenge during the construction work. All of the precautions necessary to ensure optimal occupational safety were complied with on the construction site. Overall, 37,000 hours of work were performed on 571 working days. The total costs of renovating the tunnels amounted to around €4.4 million.