underground cellar

The room they were in was apparently an underground cellar, generally used as a store-room.

Without further trouble they were made to join their comrades in the underground cellar.

Nine feet long and six wide was the underground cellar wherein they had plunged our hero.

Therefore an underground cellar is the best of all structures in which to grow mushrooms.

Providence had guided Rose and his companions to the underground cellar in the nick of time.