GEOFROST is both a consulting and a contracting company, specialized in artificial ground freezing (AGF) in tunnelling and civil engineering. GEOFROST has more than 20 years of experience with brine freezing as well as nitrogen freezing. The company is ISO certified and was founded by Anne-Lise Berggren. Main activities are stabilization and waterproofing of tunnels and construction pits, including iceplug for shut off of waterfilled tunnels, thermal calculations and refrigeration plant rental.