This volume contains a collection of 122 papers, six reports on Symposium themes, two reports on special lectures and notes on the technical discussion sessions, presented at the Fifth International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground held in Amsterdam (The Netherlands), 15-17 June 2005. The symposium was organized by the Technical Committee 28 "Underground Construction in Soft Ground" of the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE). This is the latest in a series, which began in New Delhi in 1994 and was followed by symposia in London (1996), Tokyo (1999) and Toulouse (2002). The Amsterdam Symposium was sponsored by the Dutch Public Works Department (Rijkswaterstaat) and by various national and international companies. Delegates from 34 countries discussed the contributions of researchers and engineers involved in aspects of research, design and methods of underground construction. The contributions cover: Tunnelling in soft soil, Bored Tunnels, Mitigating measures, Numerical analysis of tunnels and deep excavations, Monitoring of underground constructions, and Deep excavations. The general reports give an overview of the different papers listed in the six technical session of the symposium. The proceedings include a report on the special lecture on Tunnelling, including an overview of the work being discussed in the last four symposia of TC28 by Professor Mair, and a report on Deep Excavation in the Singapore area by Mr Shirlaw. The volume provides a valuable source of reference on the current practice of analysis, design and construction of tunnels and deep excavations in soft ground.