Antonia Cornaro and Han Admiraal held their first book launch presentation in Vienna during the CORP 2018 on “Expanding cities – Diminishing spaces” on April 4, 2018, in a special session that was accessible also to an outside audience. The presentation included readings from the various chapters of their new book “Underground Spaces Unveiled: Planning and Creating the Cities of the Future“ and anecdotes about the actual writing of the book. The audience was composed of urban planners, architects, designers, engineers, and policymakers. Comments from the audience stated that it was a learning experience and an eye-opener. The event culminated in a drinks reception to meet and greet the authors.