. . "Grand Canal Sewer Tunnel" . "Railway tunnel" . "80.0" . . . . . . . "4.8" . . . . . . . . "Dublin Port Tunnel" . . . "Drummartin Tunnel" . . "Irish Sea Tunnel" . "11.77" . . "M50" . . . . . "2" . . . . "Dublin Port Tunnel" . . . . "4600.0" . . . . "Port Tunnel" . "Dublin Port Tunnel's" .