The Utility Tunnel System was constructed starting in 1993 and completed in several phases. MSU currently maintains two miles of underground tunnel. The utility tunnels contain campus utility distribution infrastructure including steam, condensate return, irrigation water and control system compressed air piping, as well as chilled and hot water piping in some areas. Prior to the tunnels many of these lines were buried in the ground with very limited access for service and repair. The tunnel system has expanded as MSU continues to grow.