The dock was in a low orbit, attached to a planet via a structure called a lift tower, which held the shaft for the drop box used to reach the surface. The dock itself was a long structure with oblong protrusions where transports, shuttles, and other ships could dock. There were also inset rectangular slots that were module docks. The transports would deliver their modules of supplies, which would be moved from the dock into the drop box to be carried down to the surface.