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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Natural gas stocks in Ukraine’s underground storage facilities (USFs) have increased by 37 percent, to 11.966 billion cubic meters (bcm) since April 5, when Ukraine started the season of pumping natural gas into its reserves. ...
Anastasia Shepeleva. Kyiv Post. Monday, 10 Jun 2019 11:05:46 +0000.
THE HAGUE, Netherlands (AP) - A magnitude 3.4 earthquake has shaken the northern Dutch province of Groningen, the latest in a series of tremors blamed on decades of gas extraction from underground reserves. ...
Washington Times. Wednesday, 22 May 2019 05:01:45 -0400.
European aerospace giant Airbus and Paris underground operator RATP will study the viability of adding flying vehicles to the city's urban transport network, the companies said Wednesday.
The Local. Thursday, 16 May 2019 08:35:22 +0200.
Chimpanzees in captivity can successfully work out how to use tools to excavate underground food, even if they've never been presented with an underground food scenario before, according to a new study.
Science Daily. Wednesday, 15 May 2019 14:39:58 EDT.