11. Concrete lining was done during construction due to tunnel cave-ins.12. Chunks of concrete lining falling from the tunnel's ceiling have repeatedly interrupted salvage operations. 13. It includes a concrete lined hole, 6 x 8 metres and 5 metres deep. 14. The 5 tunnels are steel and concrete lined and 1, 560 feet long in bedrock. 15. The completed facility had a diameter of complete with a steel shell with of concrete lining . 16. A concrete lined Head-race channel is used to convey the water from Bong Pond to Powerhouse. 17. Chunks of concrete lining falling from the ceiling of the tunnel have repeatedly interrupted salvage operations. 18. Tunnel 1 is concrete lined ( as are all the tunnels ), straight and 66m long. 19. During the fire, chunks of the concrete lining the tunnel fell away because of the heat. 20. The concrete lining surrounding the disposal site will slowly increase its permeability over time due to degradation.
