The International Tunnelling 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 is made up of 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) at a different Member Nation.
"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; organizing cultural meetings, technical visits & informative courses, print and circulation of publications, as well as coordinating participation for scientific and technical conventions.
The association currently consists of over 600 members, which represent public companies and organizations, universities, polytechnics, professional studios, contractors, general and specialized firms.
SIG publishes their quarter-monthly periodical, "Gallerie e Grandi Opere Sotterranee", dedicated to divulgating technical and scientific knowledge. SIG is the "Nation Member" representative for Italy in the International Tunnelling Association (ITA), and sends its delegates every year to participate in assemblies and Work Grouping activities.