​Key facts about


  • Two parallel tunnel tubes of 2.900 m each – one tunnel from Bybanen tram and one tunnel for pedestrians and cyclists
  • Pedestrian and cyclist tunnel will be Europe’s longest and the world’s second longest
  • Two depot halls for storage and maintenance of Bybanen tram trains + service tunnel
  • 5 niches for technical buildings and pump station
  • Portal works on Fyllingsdalen site incl. 3-arm roundabout on top of portal
  • Excavation of multiple tunnel faces simultaneously
  • Construction site Fyllingsdalen located in densely populated area and 50 meters from one of Bergen’s largest and most popular shopping malls
  • Construction site Kristianborg partly located under E39, surrounded by residential area and business area on all sides
  • Excavation method: drill & blast
  • 500.000 m3 of masses to be excavated
  • Geology: Granitic gneiss and eye-gneiss
  • State of the art water treatment station on both construction sites
  • Reduced CO2 emission by using electrical machines, electrical cars and mud press
  • Pipe umbrella installation in Bane Tunnel Kristianborg site
  • W/F unisolated membrane of approximately 117.500 m2


Marti AS
Karenslyst allé 8b
0278 Oslo