This big tunnel with the length of 505 meters is the most magnificent part of that complex.

505米长的这条大隧道是那个综合体最宏伟的部分。

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With a length of over 35 miles, the world's longest train tunnel should become operational at the end of 2017.

这个隧道全长35英里，是世界上最长的火车山体隧道，预计将在2017年年底通车。

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One escapee told the BBC it had taken him about 30 minutes to walk the length of the tunnel.

一位越狱者告诉BBC记者，他用了将近30分钟才走出这条通道。

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First conceived nearly one-hundred years ago during the reign of Russian Tsar Nicolas II, the BST would be the longest tunnel in the world - over twice the length of Europe's 30 mile long "Chunnel" linking Britain and France.

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Officials do not say whether this would involve a tunnel or a bridge, but at around 100km in length, either would be the longest of its type in the world.

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