The main tunnel, the safety tunnel, the two underground depots including the access and one portal are all under construction at the same time.
The Marti teams in Bergen excavated a tunnel with a length of about 950m within the first months. Approximately 66'000 m3 of excavated material has been removed from the tunnels. Due to water leakage about 1'300 t of cement had to be injected. The formwork at the 70 m long cut&cover tunnel at the portal Fyllingsdalen is moving ahead as planned.
The two 2'900 m long tunnels and the two caverns with a cross-section of 130 m2 each are excavated by drill and blast method. In total, the tunnel builders will remove approximately 500'000 m3 of material.