The main tunnel runs parallel to the first tunnel at a distance of 70 metres and will also be 16.9 kilometres in length. The second tunnel is being excavated simultaneously from the north and the south. The majority of the route will be driven using two tunnel boring machines with a diameter of 12.3 metres.

The northern portal area contains a large amount of loose rock and will be excavated using both mechanical methods and blasting.

In the approximately 300-metre-long fault zone, challenging, high-pressure geological conditions are expected to be encountered. The fault zone will be excavated step by step using a pick hammer and excavator bucket before being specially secured.

The tunnelling teams from the north and south will meet 8,455 and 8,411 metres from their respective portals – a highlight of any tunnel construction project.

In the approximately 300-metre-long fault zone, challenging, high-pressure geological conditions are expected to be encountered. The fault zone will be excavated step by step using a pick hammer and excavator bucket before being specially secured.

The southern portal area contains a large amount of loose rock and will be excavated using both mechanical methods and blasting.