Hagerbach Underground Test Gallery A world-class facility, the Hagerbach underground test gallery is located in Flums, Switzerland. By shotcreteweb|2022-02-16T16:50:24+00:00January 3rd, 2014| Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkEmail About the Author: shotcreteweb