Networking is one of the most important activities of modern business life. For the members of ITA COSUF this is a lived experience. “Regularly we organize for our members this private workshop to use our excellent network to discuss and inform about the latest topics in the field of operational safety and security in underground facilities,” explains Dr. Roland Leucker, chairman of ITA COSU. Most recently, ITA COSUF organized a workshop and Oct. 28-29, 2015, in Hamburg, Germany. Around 30 ITA COSUF members took the opportunity to visit the Elbe Tunnel with a Tunnel Ventilation Demonstration, the Elbe Tunnel Control Center and the Operating Center of Hochbahn (metro and public transport operator of Hamburg) in the northern waterside metropolis.