国後、利尻への海底ケーブル施設 歴史的価値に注目：朝日新聞デジタル asahi.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from asahi.com Daily Mail and Mail on Sunday newspapers.
北方領土と根室結ぶ海底ケーブル 戦前の遺構が文化財に：朝日新聞デジタル asahi.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from asahi.com Daily Mail and Mail on Sunday newspapers.