The STS is Switzerland’s official member country representative at the ITA, the International Tunnelling and Underground Space Association.


In addition to one or more Swiss representatives participating at the AGM (annual general meeting), various Swiss experts are involved in ‘Working Groups’ of the ITA. 



The European Underground & Tunnel Forum (EUTF) represents the interests of the European tunnel community within ITA-AITES and in tunneling / underground space in general. Another strategic goal is the positioning and the influence within the European standardization and guideline commissions. More topics will certainly be added in the future.


Connected Associations

For many years, a periodic exchange with the specialized associations of neighboring countries has existed through regular contact and meetings.


The objectives depend on the country:

  • to promote the exchange of knowledge and contacts in the field of tunnel design, construction and their structures,
  • to achieve coordination of standards,
  • and to achieve a possible uniform terminology.