The International Tunneling and Underground Space Association (ITA) is the leading international organization promoting the use of tunnels and underground space through knowledge sharing and application of technology. ITA represents all aspects of tunnel and underground space planning, design and construction. Since its formation in 1974, ITA has encouraged the use of the subsurface and has promoted advances in planning, design, construction, maintenance and safety of tunnels and underground space. Currently, ITA gathers 73 Member Nations and 300 Corporate or Individual Affiliate Members.
Each year, ITA holds its General Assembly meeting and, at the same time, holds the World Tunnel Congress (WTC) in a different Member Nation around the world.
"Società Italiana Gallerie" (The Italian Tunnelling Society) is an open cultural association involved in promoting, coordinating and divulging studies and research in the field of tunnel construction and great underground works. Activities include organising cultural meetings, technical visits and informative courses, print and circulation of publications as well as coordinating participation for scientific and technical conventions.
The association currently counts 600 members, which represent public companies and organisations, universities, polytechnics, professional studios, general and specialised firms.
SIG publishes the quarter-monthly periodical, "Gallerie e Grandi Opere Sotterranee", dedicated to divulgating technical and scientific knowledge. SIG Is also a "Nation Member" for Italy in the International Tunnelling Association (ITA), and sends its delegates every year to participate in assemblies and work group activities.