Public Tender Vob/A Construction Worksecurity And Renovation Work On An Existing Drinking Water Tunnel To Restore A Stable And Permanently Functional Condition. Clearance, Shotcrete Work...  Moreconstruction Worksecurity And Renovation Work On An Existing Drinking Water Tunnel To Restore A Stable And Permanently Functional Condition. Clearance, Shotcrete Work And Anchoring