- Tunnel Page - directory of the world's longest tunnels, subsea tunnels, immersed tubes, railway tunnels, and old tunnels.
- International Tunnelling Association - encourages planning of the subsurface and promotes the use of tunnels.
- American Underground-Construction Association - promoting the design, development, construction, and use of underground facilities.
- Tunnelbuilder - features news reports of projects worldwide, and tunnel building dreams, errors, and horrors.
- MrTunnel - includes reports on major United States road tunnel projects.
- Norwegian Tunnelling Technology - covering history, projects, products, research, and development.
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