Structural engineer Dr. Nehemiah Mabry answers the internet's burning questions about city building. How are underwater tunnels made? What city has the best urban designer? How do bridges not collapse? How do floating cities work? How do sink holes happen? Nehemiah answers all these questions and much more!

Director: Lisandro Perez-Rey
Director of Photography: Constantine Economides
Editor: Ron Douglas
Expert: Dr. Nehemiah Mabry

Line Producer: Joseph Buscemi
Associate Producer: Brandon White
Production Manager: Eric Martinez
Production Coordinator: Fernando Davila
Casting Producer: Nicole Ford

Camera Operator: Chris Alfonso
Audio: Brett Van Deusen
Production Assistant: Ryan Coppola

Post Production Supervisor: Alexa Deutsch
Post Production Coordinator: Ian Bryant
Supervising Editor: Doug Larsen
Assistant Editor: Ben Harowitz