Keywords: Drilling survey on the sea Kammon railway tunnel.jpg ja 関 トンネル建設時の海上における ーリング 業 en Drilling survey on the sea construction work of Kammon railway tunnel before 1943 海底死闘六年関 トンネル Ministry of Railways Japan / 鉄道 other versions Custom license marker 2015 06 01 PD-Japan-oldphoto Kanmon Railway Tunnel Uploaded with UploadWizard |