Jelaskan Terowongan Hokkaidō Sakhalin Asia dari Jalan Raya Trans Global

It may also be possible to connect Japan to mainland Asia by constructing two tunnels extending north from Hokkaidō to Sakhalin Island (the Sakhalin Hokkaidō Long Tunnel), which would be 25 miles (42 km) long and a second tunnel from Sakhalin to the Siberian Russian mainland (the Sakhalin Tunnel), which would only be 4.2 miles (7 km) long. Moreover, Sakhalin Island region is a major oil-producing region, and the introduction of a pipeline would add a valuable secondary means of oil transport.