Even more difficult than finding space to build increasingly taller skyscrapers, is finding room to place new urban underground infrastructure. Urban underground space is an extremely rare and limited resource, and the growing underground race demands efficient solutions due to climate changes in our atmosphere. Subways, underground parking lots, gas piping, drainage, and sewers systems have been built throughout the years in large cities around the globe, and, in several cases, built without any master planning or blueprints. In this class, we will present how Civil 3D software can be used to design drainage systems in a high-density urban underground infrastructure environment, and how Dynamo software can help to enhance the workflows.