The devs must ask to find a drill tool that digs a cube around the building, the dimensions of which are arranged from the outermost voxel or element of the construction. As a result, players will be asked to ensure their buildings don’t have any voxels outside what they will request for excavating. There’s still no date for Demeter yet, but builders in DU would be fine to find their existing structures before the digital landslide will succeed. source: official website.
