Date: 12/31/1969 Views: 2700
Date: 12/31/1969 Views: 9991
Date: 03/20/2009 Views: 4469
Date: 08/23/2023 Views: 204739
The area where the tie bar passes through a depression in the tunnel has to be prepared for closure. The tunnel depression with the areas of fiberglass and foam core removed in preparation for closure.