Cathedrals, star forts, towers and lighthouses on the surface; rivers between them; documented underground sites below; and the proposed conduits of the grid model joining them. Zoom from one city out to the whole globe.
Reading it. Structures, rivers and underground sites are documented locations. The grid links are your model drawn as geometry: a drawing rule (“nearest within N km”), not a found connection. Conduit depth is a display setting so the layer can be seen from above, not a measured depth.