The 95.3-mile (153.5 km) long Gotthard Base tunnel network now being drilled out beneath the Alps, when finally completed in about ten years, will be the longest underground tunnel ever constructed.

目前正在阿尔卑斯山脚开凿的圣哥达隧道网长95.3英里(153.5公里)，将在10年以后完工，也将是有史以来最长的地下隧道。

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Project Seagate was a major project with a huge underground base location and they were working on many different sub-projects.

希捷工程是一个重大的工程项目，它有一个巨大的地下基地位置，那里的人员工作在许多不同的次级项目中。

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Just steps away from Marques DE Pombal Underground Station, this luxury hotel is the perfect home base in the vibrant city of Lisbon, Portugal.

远离马克斯德蓬巴尔地铁站只有几步，这家豪华酒店是在里斯本的充满活力的城市完美的基地，葡萄牙。

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At the base, they find large areas of the underground mall still standing as they were the morning of September 11, nearly untouched.

CNN: workers

Since tax evasion is a major driver of the underground economy, efforts to expand the tax base and improve tax collection can help curtail illicit flows, says Kar.

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The 25.5 acre (10.3 hectare) Neatishead base, near Wroxham, includes a high-security fence, a Cold War underground bunker and a helipad.

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