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Discover LudwigThe phrase "are underground" is correct and usable in written English.
It can be used to describe something that is located below the surface of the ground or to refer to a subculture or movement that operates outside of mainstream society.
Example: "The tunnels that are underground were used for secret meetings during the war."
Alternatives: "are beneath the surface" or "lie below ground level".
Dictionary
are underground
adjective
Below the ground; below the surface of the Earth.
Exact(60)
Potatoes are underground stems.
Four stories are underground.
"There are underground networks everywhere".
as are underground tunnels you can explore.
All the leaders of Hamas are underground.
They are underground!" Another former Koch adviser said, "They're smart.
In most cases, these restaurants are underground in name only.
That's why so many of these rooms are underground.
In both species, the edible parts are underground tubers.
To prevent noise pollution, all of Bath's nightclubs are underground.
"For them to work with people who are underground.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com