The RETC conference continues to advance the tunneling industry by encouraging attendees from around the world to share their experiences, successes, challenges, and valuable lessons learned. The papers from the successful conference are contained in the 1344-page hardbound volume and on the enclosed CD. They provide excellent technical content and vaired case histories from some of the most difficult tunneling projects on the drawing board and under construction. Call SME customer service for availability of proceedings from previous RETC meetings.