So far, when the phrase "underground map" comes up, there are very little who say "hell no." Though this map concept would be hell for galleons, spires, and possibly modules, the whole idea of flying over underground lakes, dodging stalagmites, ducking through tight tunnels, fire at an enemy ship, all of this in the dark, and possibly being forced to use flares for a light source in some areas is still a very appealing notion.