Feasibility studies, Conceptual design, Preliminary design, Detailed design, Tendering and contract, Supervision, Operation and maintenance, Independent checking, Hydro tunnel, Underwater tunnel, Mountain tunnel,

Tunnels are extensive projects, where coordination is the key to get the best technical solutions. EFLA has been involved in various designs of tunnels, including hydro tunnels for hydropower plants to road tunnels, underwater tunnels and others that go through mountains, through hard rock or through demanding geological conditions.


EFLA has both designed and supervised new tunnels, and strengthened existing tunnels in various conditions.

EFLA has extensive experience in the design of electrical systems, lighting, telecommunications, operation systems and control rooms in tunnels.

All phases of tunnelling

EFLA has performed a number of tunnel assignments and been involved in all relevant disciplines. EFLA has been part of all phases of tunnelling from preparation to planning and design ending in supervision and finally operation.

Among services provided are

  • Feasibility studies
  • Conceptual design
  • Preliminary design
  • Detailed design
  • Tendering and contract
  • Supervision
  • Operation and maintenance
  • Independent checking