is the process of tunnelling with a TBM (Tunnel Boring Machine) and laying pipe behind while not disturbing the soil in the area.
Tunnel Boring Machines
Used to excavate Tunnels through a variety of different geologies. They can be used to bore through hard rock, sand and anything in between.
A tunnel boring machine has the advantages of not disturbing surround soil and earth. This negates the risk of soil settlement, and makes it suitable to use in well populated areas.