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"High Performance Tunnelling achieved by Innovation, Development, Knowledge and Techology"

NTN companies provide a wide range of services in the field og development, design, construction, operation and maintanance of tunnels and underground fasilities. NTN is established to provide commercial services to international clients and customers.

Owners
Norwegian National Rail Administration
Norwegian Public Roads Administration

Education and Research
Norwegian University of Science and Technology (NTNU)

Research and Consulting
Norwegian Geotechnical Institute (NGI)
SINTEF

Engineering and Design
Multiconsult AS
Norconsult AS
Sweco Norge AS

Consultants and Advisors
K. Garshol - Rock Engineering Ltd. Consulting within rock mechanics, rock support, ground water control and tunneling.
PAB Consult AS - Managment and consulting within general tunnelling

Contractors
GEOFROST AS - Ground stabilization and water proofing by ground freezing
Giertsen Tunnel AS - Construction and design within waterproofing and tunnel sealing
KF Gruppen AS - Construction Managment within tunnelling and rock support
Leonard Nilsen & Sønner AS (LNS) - Mining and tunnelling 

Suppliers
Andersen Mek. Verksted AS (AMV) - tunnelling equipment
Bever Control AS - computer controlled tunnelling
Galvano TIA - rock bolts
ITS - grouting packers and accessories
Pretec AS - rock support, water and frost proofing
Protan AS - ventilation ducting/systems
Skumtech AS - membrane and PE-foam systems
Vik Ørsta AS - rock bolts and accessories