Sealed and insulating tank for storing and/or transporting a liquefied gas

A sealed and insulating tank for storing and/or transporting a liquefied gas, the tank comprising successively, from the inside to the outside:

• an internal reservoir, which is sealed and self-supporting, the internal reservoir having an inner surface for contacting the liquefied gas, and an outer surface,
• an insulating barrier covering the outer surface of the internal reservoir, the insulating barrier being attached to the internal reservoir,
• an outer sealed membrane covering an outer surface of the insulating barrier, the outer sealed membrane comprising a piece of sheet metal provided with bellows or corrugations so as to allow elastic deformation, the outer sealed membrane being attached to the insulating barrier or the internal reservoir, and
• wherein an intermediate space located between the internal reservoir and the outer sealed membrane contains a gas phase under depression in order to press the outer sealed membrane against the outer surface of the insulating barrier, wherein the depression consists of a difference between the pressure prevailing inside the intermediate space and the atmospheric pressure.