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Discover Ludwig"is underground" is a correct and usable sentence in written English.
You can use it whenever you need to refer to something which is below the ground level. For example: "The tunnel is underground."
Dictionary
is underground
adjective
Below the ground; below the surface of the Earth.
Exact(60)
"Everything is underground," he said.
"The only way is underground.
Now the government is underground".
A good place to begin is underground.
As at Hradcany, the trouble is underground.
The entire restaurant is underground.
All of eastern Ghouta is underground.
Redes's own history is underground, too.
The cemetery's true grandeur is underground.
He went on, "The action is underground.
More than half the building is 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