Conwy tunnel
43:53
The Conwy Crossing | Various Stages of Construction of the Tunnel | 1991
49:46
THE SLATEMAKERS (1980)
28:40
The Building Of Llyn Brianne Dam - Archival Construction Film
3:26:18
4K CABVIEW Bar - Bijelo Polje -102 tunnels -96 bridges -1029m altitude change from Sea to Mountains
38:46
The Conwy Tunnel Project, Commemorative VHS Film
26:37
Murphy PIpelines 1990 Cambridge to Epping Pipeline
42:20
First Four Years (1951) | BFI National Archive
24:22