Abstract

Traditional immersed tunnelling results in a tunnel buried beneath the waterway which it traverses. A new development- the submerged floating tunnel - consists of suspending a tunnel within the waterway, either by tethering a buoyant tunnel section to the bed of the waterway or by suspending a heavier-than-water tunnel section from pontoons. When should we use the method: tethering a buoyant tunnel section to the bed of the waterway, and how to tether the tunnel is a main issue in this article.