A tunnel is a tube hollowed through soil or bedrock. Constructing a tunnel, however, is one of the most complex challenges in the field of civil engineering. A tunnel may be for pedestrians or cyclists, for general road traffic, for motor vehicles only, for rail traffic, or for a canal. Some are aqueducts, constructed purely for carrying water for consumption, for hydroelectric purposes or as sewers while others carry other services such as telecommunications cables.
Many tunnels are considered technological masterpieces and governments have honored tunnel engineers as heroes. That's not to say, of course, that some tunnel projects haven't encountered major setbacks.
A tunnel is an underground passageway. The definition of what constitutes a tunnel is not universally agreed upon. They should be completely enclosed on all sides, save for the openings at each end.
This project presents design of Nablus Tunnel which connects Sufian Street with the new Commercial Complex Building of Nablus Municipality. The project includes design of excavation support system which is bored cast in-situ piles (sheet pile wall), design of retaining walls and design of mat foundation. In addition to that, this project talks about tunnels in general.