The underground passage was able to keep up to 9 submarines at a time, together with all the equipment for repairing and diagnostics.

这条地下通道可以同一时间维护多达9架潜艇，一起修理和诊断所有的设备。

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We found a spot where we could station, anchor and go down to the entrance to the underground river, avoiding a time-consuming passage across the thick forest.

我们找到了一个地点，在这里我们可以立足，固定锚点（anchor）然后向下攀爬到地下河的入口，从而避免耗时的穿过浓密的森林。

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Imagine the condition of men living in a sort of cavernous chamber underground, with an entrance open to the light and a long passage all down the cave.

想象人们住在一个地下洞穴之中的情形，一个出口通向光明，一条漫长的通道引向洞内。

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The endless layout includes more than 50 bedrooms, a series of intimate drawing rooms and a regally appointed dining room with an underground passage to a separate kitchen building.

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At the same time, they built an entirely new building behind the palace, and the hotel occupies both edifices, which are connected both by an underground passage and a private walled park-like plaza.

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