The present invention relates to a fire-stopping and fire-smothering storage container housing an inner space for storing materials which is defined, relative to the outside space (2), by a plurality of sides (3a, 3b, 3c, 3d, 3e, 3f) and including at least one fire door assembly (4). The invention includes an essentially fire-stopping, airtight structure of walls (5, 5') forming, together with the door assembly (4) which is also airtight, each side of the container, a system for attaching and assembling said structure and the door assembly, air passages (9a, 9b) extending through said structure, and air-sealing gaskets (8) making it possible to make the air passages airtight, such as to make the container airtight enough to create an air-depriving effect in the inner storage space that rapidly smothers any fire that starts inside of same.