... longspan tunnel 大跨度隧道 loop tunnel 环形隧道 losing of passenger 旅客遗失物品 ...
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tunnel loop 隧道套线
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This loop also passes through the Sasso San Gottardo, a demilitarised tunnel that is part of a network of clandestine Swiss Army caves and tunnels built into the mountain and used as bunkers during WWII and the Cold War.
BBC: In Swiss utopia, the devil dwelled
The tunnel will also create a 13-mile (21km) loop between Bath and Midford via the canal towpath in the city.
BBC: Combe Down tunnel has light and sound display installed
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