"Società Italiana Gallerie" (The Italian Tunnelling Society) has been dedicated to divulgating its expertise on tunnelling operations and major underground constructions for over 40 years.


Società Italiana Gallerie (SIG) is the Italian Tunnelling Society and one of the funding members of the International Tunnelling Association (ITA).

SIG is a scientific non-profit association, founded in 1974; it mainly promotes and coordinates studies and research in the field of tunnelling and underground construction works. The association takes actively part in the ITA-AITES Working Group (WGs) in order to  share expertise and technical, scientific and business know how in underground construction.

SIG currently counts more than 650 members, which represent public bodies and research organizations, general contractors, construction companies and manufactures, as well as engineering firm, consultants and universities. It brings together all the different spheres of the Tunnelling in Italy, thus being a reference point for the whole industry, in terms of promotion of dialogue, knowledge sharing and professional training. Furthermore, the Young Member Group of the Italian Tunnelling Society, founded in 2016, contributes to  build out a professional network where the young professionals can develop knowledge and raise their awareness about tunnelling industry.

SIG has a strong expertise in organizing congresses and conferences.

In collaboration with ITA, la Società Italiana Gallerie organized  the World Tunnel Congress in 1986 in Florence - "Large Underground Works" - and in 2001 in Milan - "Progress in Tunnelling after 2000" – the last in collaboration with the Swiss Tunnelling Society. In 2013 in Bologna, SIG promoted an international  congress on "Tunnels and Underground Space for the development of Europe".

The association also organises technical site visits to relevant underground construction sites, in Italy and abroad – visits held in the recent past include the Follo Line construction sites in Norway and, in Italy, the Genoa-Milan high-speed railway and the Brenner Base Tunnel.

SIG is also proud to be Sponsor of Level II Masters in Tunnelling and Underground Constructions, activated in Italy at the Politecnico di Torino, the Politecnico di Milano and the Sapienza University in Rome. These collaborations aim to bridge the gap between Universities and Industry, in order to support the growth of future Industry leaders.  

Furthermore, Gallerie e Grandi Opere in Sotterraneo is the SIG’s magazine, which reached issue 123 in October 2017, and offers technical and scientific articles, as well as news on construction works and tenders all around the world, bulletins from the Italian Tunnelling market, reports on technical site visits, training courses and international congresses.

SIG is currently working on the organization of the ExpoTunnel 2018 Conference in Bologna and the WTC 2019 in Naples.

Bringing the WTC to Italy for the third time is a great achievement and honour for SIG, but we are all aware it represents a huge responsibility and we are therefore doing the best to organize a wonderful WTC, profitable for the mind and joyful for the spirit.

In May 2019, Naples will be the world capital of Tunnelling and will see the participation of more than 1,500 delegates. Experts in planning, design, construction and management of underground works, from all over the world,  will have the opportunity to report, discuss, update, and network in the large exhibition area linked to the Congress. Here exhibitors will be able to show their know-how, materials, technologies, machines and equipment, also in the wide external spaces of the convention center Mostra D’Oltremare.

The conference title – Tunnel and Underground Cities: Engineering and Innovation meet Archeology, Architecture and Art – perfectly represents Italy, Naples and its underground works: tunnels, underground cities, engineering, innovation and Italian identity.  Archaeology, Architecture and Art are all features combined in the extraordinary Naples Metro Stations (also known as the “Triple A” Metro Stations, not by chance).

We look forward to seeing all of you from 3-9 May 2019 in Naples!

For further information please visit the web site