Tunnel

Tunnel is a landscaping structure introduced in Update 7. It is a demolition tool that removes individual Terrain Blocks by replacing the targeted block with an instantaneous explosion upon construction completion. Builders who finish a Tunnel are not harmed by the explosion.

A Tunnel is placed on any Terrain Block. When construction completes, the targeted Terrain Block is removed and replaced immediately with a platform to support any structures that existed above the removed block. The platform exists only to prevent unsupported structures from collapsing at the moment of removal and can be demolished afterward. Placing a Tunnel site above ground is possible, but any structure directly beneath such a site is blocked from being deleted until the Tunnel is either completed or cancelled.

Tunnels provide a specialized approach to reshaping terrain. Because they can be placed without first demolishing the above terrain and because their temporary platforms require no labor to remove, Tunnels enable blasting workflows that are otherwise difficult. Strategic combinations of dynamite and Tunnels can isolate large sections of terrain so those sections are held only by platforms; once the platforms are demolished the remaining terrain falls away, allowing efficient removal of large contiguous chunks. Care is required when removing platforms, as demolishing them can trigger cascading demolitions, especially on long overhanging Terrain Blocks.

Tunnels are classified as structures rather than buildings. They are not intended for continuous occupancy or use and function primarily as a transit/demolition mechanic.

• A Tunnel can be constructed on any Terrain Block and detonates upon completion; builders completing it are not affected by the blast.
• The removed Terrain Block is instantly replaced with a platform that supports above-ground constructions; this platform can be demolished but may cause cascading collapses.
• Tunnel sites may be placed above level, but any structure directly under the site cannot be deleted until the Tunnel is completed or cancelled.
• Use Tunnels together with dynamite to isolate and remove large terrain sections more efficiently.