There are wide passages, narrow ones at all different depths, like underground tunnels in the limestone.

在所有不同的深度都有宽阔、狭窄的通道，就像石灰岩中的地下隧道。

youdao

It's not a dog, but a rodent that lives in underground tunnels.

它不是一直狗，而是一种住在地下隧道里的啮齿类动物。

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Underground tunnels would be used to transport goods for consumers and businesses between stations, again via robots.

车站之间的地下隧道将用于为消费者和企业之间运输货物，同样是机器人控制。

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The border closures have forced Gaza to rely on goods smuggled through underground tunnels from Egypt.

VOA: standard.2010.06.17

Many goods are smuggled from Egypt through a network of underground tunnels into Gaza.

BBC: Gaza construction convoy crosses from Egypt

These are giant machines which employ powerful magnets to guide subatomic particles through long underground tunnels.

ECONOMIST: Maglev trains

At Will Rogers, passengers were directed into underground tunnels as the storm passed just north of the airfield.

WSJ: Tornado-Hit Oklahoma Struck Again; Mother and Baby Dead