Longest tunnel in the world
The
Seikan Tunnel (青函トンネル
Seikan Tonneru) or 青函隧道
Seikan Zuidō, is a
53.85 km (33.46 mi) dual gauge railway tunnel in
Japan, with a 23.3 km (14.5 mi) long portion under the seabed. The track level is about 100 m (330 ft) below the seabed and 240 m (790 ft) below sea level.
[1] It extends beneath the
Tsugaru Strait — connecting
Aomori Prefectureon the main Japanese island of
Honshu with the northern island of
Hokkaido — as part of the standard gauge
Hokkaido Shinkansen and the narrow gauge
Kaikyō Line portion of the
Hokkaido Railway Company (JR Hokkaido)'s
Tsugaru-Kaikyō Line. The name
Seikan comes from combining the
on'yomireadings of the first characters of Aomori (青森), the nearest major city on the Honshu side of the strait, and
Hakodate (函館), the nearest major city on the Hokkaido side.
Seikan Tunnel
Map of the Seikan Tunnel
Longest Bridge in the world
The Lake Pontchartrain Causeway is the world's longest continuous bridge over water.
Credit: Gary Fowler/Shutterstock
The world's longest bridge is the Danyang–Kunshan Grand Bridge in China, part of the Beijing-Shanghai High-Speed Railway. The bridge, which opened in June 2011, spans 102.4 miles
(165 kilometers). Another part of that train line, the 70.8-mile (114-km) long Langfang–Qingxian viaduct, is the second longest bridge in the world.
Road Tunnel costs on land are about a $1 billion per KM. An underwater tunnel would cost many times more. lets say twice. Then this tunnel would cost $800 billion or near to a trillion $'s.
Thats more than 3 times Pakistans GDP
It's a pipeline... Stupid Pakistani reporters