A cellar is always underground, so you can just call it a cellar. A cellar is where you'd store stuff like food or random items.
Cellar
In Britain, an underground room is a cellar.
Cellar Basement
http://winecountry.blogspot.com/2006/04/largest-underground-wine-cellar-in.html
The word 'cellar' is both a verb (cellar, cellars, cellaring, cellared), and a noun (cellar, cellars). Example uses:Verb: He's an avid collector, he has a place underground to cellar his wine.Noun: We've converted the cellar into a playroom.
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.
When tornadoes strike, you should get underground immediately, eg. cellar
The word cellar is a singular noun. The plural is cellars.
The safest thing to do is to go to an underground shelter such as a basement or cellar.
It means "wine cellar" or quaint place, often underground in the city, in which to socialize and drink good German wines.
The term most likely refers to a storm cellar or underground storm shelter. This is a small underground room designed for people to take cover from a tornado.
In an underground cellar, some people say in a ditch face down but....that wouldn't help -.-