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Karawankentunnel 2nd tube

Project description

The single-tube Karawanken motorway tunnel through the Alpine Karawanken mountain range is part of the European TEN-V corridor between Slovenia and Austria and is subject to an extensive expansion and modernisation programme. As part of this project, a second tunnel tube will be built and the existing tube will be rehabilitated. The Austrian section of the tunnel is 4.4 km long and excavation was started at the beginning of the project. The Austrian section of the tunnel is 4.4 km long and excavation started in 2018 and the construction lot limit was reached on 23 September 2021, while the remaining 3.6 km section of the tunnel is located in Slovenia and excavation started in August 2020. Breakthrough is scheduled for 2023. Both tubes and the cross-cuts to the existing tube are being advanced by blasting according to the NÖT.

Place: Carinthia, Austria and Slovenia

Owner/Client: ASFINAG (Austria); DARS (Slovenia)
                          Swietelsky Tunnelbau (Austria);
                          Geoportal, Geotocka (Slovenia)

Performance period: since 2018

GEODATA services:

On the Austrian side, Geodata has been commissioned with the complete construction and heading survey and the supply of the marking material for the 3D displacement measurements and the geotechnical instrumentation. For the Slovenian section, Geodata is supplying and installing the geotechnical instrumentation and operating the KRONOS tunnel information system.


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