The word underground is a noun. Underground means (1) electric underground railway, (2) a secret group organized to overthrow a government or occupation force.
Underground is also an adjective that means (1) used of independent armed resistance forces, (2) under the level of the ground.
Underground is also an adverb that means (1) beneath the surface of the earth, (2) in or into hiding or secret operation.
The following articles and web pages elaborate on the word underground.
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A wealthy Maryland stock trader was found guilty of second-degree murder and involuntary manslaughter Wednesday in connection with a deadly fire in a network of tunnels he planned to use as an underground nuclear bunker.
Samuel Chamberlain. Fox News. Thursday, 25 Apr 2019 02:12:26 GMT.
A prosecutor says a wealthy stock trader engaged in "extreme risk-taking behavior" before a fire broke out in his Maryland home and killed a man who was helping him dig tunnels for an underground nuclear bunker
ABC News. Tuesday, 23 Apr 2019 18:25:28 -0400.
Musk's Boring Co has proposed a privately funded 35.3-mile "loop project" that would include twin underground tunnels transporting passengers at speeds of up to 150 miles per hour. ...
Yahoo. Wednesday, 17 Apr 2019 14:08:00 -0400.
Researchers report that the distribution of forest types worldwide is based on the relationships plant species forged with soil microbes to enhance their uptake of nutrients. ...
Science Daily. Wednesday, 17 Apr 2019 13:00:30 EDT.
Works are under way to equip two underground roads here with the latest fire-fighting system, and the $163.5 million project is slated to be completed by 2022.
Straits Times. Monday, 15 Apr 2019 05:00:00 +0800.