Dublin Port Tunnel
Dublin Port tunnel opened to traffic on December 20th, 2006. It is a twin bore tunnel of 4.5km in length with a height clearance of 4.65m. It is part of the M50 motorway and completes the northern part of the C-Ring around Dublin city. It is a dedicated route for Heavy Goods Vehicles between the Port, located in the heart of the city and the greater road network via the Coolock Lane Interchange (M50).
Using both shielded hard rock and open face TBMs the project constructed two tunnels with a cut and cover setion at the end of each. Pipe jacking was used to construct the 60 metres of tunnel under the rail line at Alfie Byrne Road
Further information is available here and here.