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  | “We disseminate and promote the knowledge and expertise in underground constructions„ |  |  | 
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  |  | Swiss Tunnelling Society   The STS is actively involved in all questions related to underground constructions: geology, civil engineering, mechanical engineering, electrical and ventilation systems and safety engineering, both during the planning phases as well as during construction.   Discover the group Join now |  |  |  | 
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  | STS in numbers        
 50 years Swiss Tunnelling Society
 629 members
 1'852 tunnels built in Switzerland
 2'544 kilometers of tunnels |  |  
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