It is called a basement
Cellar Basement
A room situated below the ground floor of a building is typically referred to as a basement. Basements are commonly used for storage, utility rooms, or additional living space in residential buildings. They are constructed below ground level to provide structural support and additional usable space within a building.
A basement of a house is the room or space that is below ground level. A basement appliance that can heat your house is a furnace.
Ground level
A basement is a large room under the ground. A dungeon is a room under the ground.
An underground room is a room that is located below ground level, typically beneath a house or building. These rooms can serve various purposes such as storage, wine cellar, storm shelter, or even as a hidden room.
A room situated below the ground floor of a building is commonly referred to as a basement. Basements are often used for storage, laundry, or as additional living space, and can be partially or fully below ground level. They may also house utilities such as heating and plumbing systems. In some cases, basements can be finished to create functional areas like recreation rooms or home offices.
A basement A bunker A cellar A cave A cavern
The floor.
A kiva is a room used for religious rituals and spiritual ceremonies. The room is used by modern Puebloans and the modern Hopi. They are typically below the ground and square.
An underground room is often referred to as a "basement." Basements are typically used for storage, utility functions, or living space and are located below the main level of a building. They can also be called "cellars," especially when used for storing food or wine.
Room heaters are kept at ground level because warm air rises, allowing the heat to circulate more effectively throughout the room. By positioning the heater lower, it ensures that the warm air can gradually fill the space from the floor up, creating a more even and comfortable temperature. Additionally, placing heaters at ground level minimizes heat loss through ceilings and helps maintain a consistent warmth closer to where people typically sit or move around.