Sakhalin–Hokkaido Tunnel

The Sakhalin–Hokkaido Tunnel (or potentially bridge) is a proposed connection to link the Russian island of Sakhalin with the Japanese island of Hokkaido through the Russia-Japan border. Cost estimates by Russia in the year 2000 put the project at $50 billion. When the project is complete, it will span across the Soya strait for 45-kilometre (28-mile), making it the longest bridge in the world.