Was heißt »Untergrund« auf Englisch?

Das Substantiv Untergrund lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Deutsch/Englische Beispielübersetzungen

Die Widerstandsbewegung ist in den Untergrund gegangen.: The resistance movement has gone underground.
Ein solcher Schuh kann bei nassem Untergrund rutschig sein.: This kind of shoe is apt to slip on wet ground.

On the ground floor of the building is a tourist information office.
There's a tourist information centre on the ground floor of the building.
Tourist Information is on the ground floor of the building.
It was as if the ground had swallowed him up.
It seemed as if the ground had swallowed him up.
The way out is on the ground floor as well.
The exit is likewise on the ground floor.
The base camp stopped receiving signals from the climbers after they reached 8,000 meters.
This is about 8 feet above sea level. In case of a tsunami, please evacuate to higher ground immediately.
Social media posts showed pictures and videos of fences, walls and backyards covered with spiders seeking dry and higher ground.
The moon was reflected in the water's surface.
Although those projects did get off the ground, they didn't produce any tangible results.
There is a tourist information centre on the ground floor of the building.
Potatoes grow in the ground, whereas apples grow on trees.
Tom made a decision that would change his life from the ground up.
Is there an underground in your city?
Is there an underground railway system in your city?
The leaves of the water lily float on the surface of the water.
The surface of Venus is hot enough to melt lead.
The jaguar hunts sloths on the ground, when they come down from the canopy to poop.