1. Introduction -- 2. Development of the immersed tunnel -- 3. Current forms of immersed tunnel -- 4. Developing an immersed tunnel scheme -- 5. Environmental impact -- 6. Marine environment -- 7. Mechanical and electrical installations -- 8. Approaches and service buildings -- 9. Design principles -- 10. Joints -- 11. Durability -- 12. Foundations -- 13. Earthworks -- 14. Construction of tunnel elements -- 15. Finishing works -- 16. Operation and maintenance -- 17. Contract forms -- 18. The future.