Support

Supports are pillars built to prevent or control cave-ins. A support connects the tile above, its four adjacent (not diagonal) tiles, the four tiles adjacent to the support itself, the tile below the support and its four adjacent tiles. Supports transfer support from any of their connected tiles to all other connected tiles. A completely unsupported support will cave-in. Multiple supports can be chained together to transfer support over a long distance without creating climbing/jumping paths.

Unlike constructed walls, supports do not create a floor tile on the Z-level above. Supports do not block movement, fluids or missile fire. Supports made of wood are vulnerable to fire and certain building destroyers.

Supports must be built on solid surfaces, but do not require that the floor remains after construction is complete. "Hanging" supports can be constructed by building them atop constructed walls, then removing the walls, allowing chains of supports without any walkable tiles.

Supports can be linked to levers and pressure plates, and collapse when triggered, causing a cave-in if the support was the only thing preventing it. This can be used as an offensive weapon and for other purposes.