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zj) In The 1920s, Work On The Tunnel Began With Drilling Small Shafts Into The North Facing Cliff.JPG
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%20In%20The%201920s%2C%20Work%20On%20The%20Tunnel%20Began%20With%20Drilling%20Small%20Shafts%20Into%20The%20North%20Facing%20Cliff.JPG "zj) In The 1920s, Work On The Tunnel Began With Drilling Small Shafts Into The North Facing Cliff.JPG")