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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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