1. A pioneering mega project : general project description -- 2. The Westerschelde Tunnel : history and background -- 3. The design of the Westerschelde Tunnel in a nutshell -- 4. Safety -- 5. The protection of the Westerschelde Tunnel against fire -- 6. A life span of at least 100 years -- 7. Geotechnical circumstances -- 8. Access ramps : design and implementation -- 9. The tunnel lining -- 10. Tunnel boring machines -- 11. The boring and tunnelling process -- 12. Separation plant and boring spoil -- 13. Cross connections -- 14. Civil fitting out and logistical process -- 15. Tunnel installations -- 16. Aesthetic aspects -- 17. The contract and project management -- 18. Maintenance aspects.