A new staircase, reminiscent of theatre promenade staircases, cascades its way down to the underground main gallery space from the ground floor, going through secondary office Spaces.

一个新的楼梯，让人联想起戏剧长廊，从地面向下延伸至主要的画廊空间，经过次要的办公空间。

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In addition, Sunchon appears to have a "1350 meter taxiway extend [ing] from the UGF [underground facility] to a point beyond the main parking aprons."

此外，顺天似乎有一条从UGF(地下设施)延伸至主停机坪上某点，长约1350米的滑行道。

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Underground coal gasification is the main direction of coal mining and utilization in the future.

煤地下气化是未来煤炭开采和利用的主要方向。

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This was the theory behind Canadian artist Peter von Tiesenhausen's decision to bury a sculpture almost four metres underground, beneath a sewer at the main crossroads in the city of Sarnia, Ontario.

BBC: Why make art no-one can see?

Mike Chinoy, a former CNN correspondent who has visited North Korea 15 times, said the current confusion about Pyongyang's capabilities recall a similar episode in 1998, when U.S. spy satellites discovered an underground complex at Kumchangri, not far from North Korea's main nuclear facility at Yongbyon.

CNN: 5 things we still don't know about North Korea's nukes

They chalked up their problems in the New York area to devastating flooding that, in addition to knocking out power, disabled backup generators and disrupted the underground cables that carry calls, texts and Web searches from cell towers back to the main networks.

WSJ: Outages Expose Wireless Carriers' Backup Plans