TRANS-national TUNnel operational CBRN risks mitigation (TRANSTUN) is a more than 1M€ Public-Private-Partnership Co-funded by the EU Internal Security Fund Programme, and implemented by 7 partners from Italy, France, Belgium and Spain.

TRANSTUN represents a unique example of Public-Private-Partnership focused on increasing the interagency and inter-country capacity of response in case of CBRN events against EU Critical Infrastructures. During its 25 months of implementation, TRANSTUN created a Network of stakeholders representing more than 15 countries worldwide, drafted a set of Operational Guidelines based on a tailored Risk assessment, and undertook a real-life exercise at the Bielsa-Aragnouet Tunnel, which is located in the Pyrenees border between France and Spain, involving more than 250 players and 50 observers from 8 EU countries.

In this framework, TRANSTUN Operational Guidelines have been drafted in collaboration with a pool of 45 practitioners involved in 7 Operational Workshops in order to collect relevant advice and experience about the most suitable procedures and equipment currently available or needed to enhance the protection of EU Cross-Border Tunnels against chemical events.

As a result, two different but complementary Operational Guidelines have been drafted by the TRANSTUN project and further 7 experts have been involved to formally review the final version of both Guidelines.