A basement
A bunker
A cellar
A cave
A cavern
A person who gets coal from under the ground is typically called a coal miner.
The area under the ground that contains groundwater is called the "saturated zone" or "aquifer." It is the region where the spaces between rock and soil particles are filled with water, allowing for the storage and movement of groundwater.
The oil found under the ground or sea is called crude oil. It is a naturally occurring fossil fuel composed of hydrocarbons that can be refined to produce various products like gasoline, diesel, and jet fuel.
A large amount of water that has built up under the ground is called an aquifer. Aquifers are underground layers of rock or sediment that hold and transmit water. They are an important source of freshwater for many regions around the world.
The under ground passage in a ringfort is called a souterain. These may have been used to store food or to hide during raids. There is one nearby which links up two areas.
A basement is a large room under the ground. A dungeon is a room under the ground.
It is called a basement
The space under a staircase is called a spandrel.
The room under the roof is called an "Attic".
A basement...
water
Spuds
It would be called the "ATTIC".
The underground railroad.
Potato
because lava under the ground is rising causeing less room for the trees to grow
Its called a basement or a cellar