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

The compound is on three lots and would include a main home of 42, 000 square feet part of it underground a guest house, pool cabana, gate house and another residence of up to 20, 000 square feet.

WSJ: Living