Columbia subject headings:
Channel Tunnel (Coquelles, France, and Folkestone, England)
Railroad tunnels--English Channel.
Tunneling--English Channel.
Tunnels--English Channel.
Underwater tunnels--English Channel.
Harvard subject headings:
Princeton subject headings:
Channel Tunnel (Coquelles, France, and Folkestone, England)
Ocean engineering--English Channel.
Railroad tunnels--English Channel.
Tunnels--English Channel.
Underwater tunnels--English Channel.