[header] How to build a tunnel [title] Consider where the tunnel will be built. [step] The proposed tunnel's location will determine what tools and techniques are necessary to construct it and prepare it for its intended use. Tunnels can be divided into 3 types : [substeps] Soft-ground tunnels. 
These tunnels require support at the openings to keep the tunnel from collapsing. These tunnels are usually shallow and used for subways, water delivery, and wastewater removal systems.