The Gotthard Base Tunnel (GBT) is a railway tunnel in the heart of the Swiss Alps expected to open in 2016. With a route length of 57 km (35.4 mi) and a total of .\r
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The Chunnel - Worlds Longest Underwater Tunnel - History Channel HD At its lowest level, it is 75 m (250 feet) deep. At 37.9 kilometres (23.5 mi), the tunnel has .\r
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The completion of the worlds longest rail tunnel has been completed in Switzerland, making way for a high-speed railway connection between northern and .\r
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The ten longest railway tunnels in the world, inspired by Switzerlands recently completed tunnel which set a new record. Subscribe to TDC: .
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The Chunnel - Worlds Longest Underwater Tunnel - History Channel HD At its lowest level, it is 75 m (250 feet) deep. At 37.9 kilometres (23.5 mi), the tunnel has .\r
\r
The completion of the worlds longest rail tunnel has been completed in Switzerland, making way for a high-speed railway connection between northern and .\r
\r
The ten longest railway tunnels in the world, inspired by Switzerlands recently completed tunnel which set a new record. Subscribe to TDC: .
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