Abstract: A melting and casting plant for operation at least under a vacuum and having a vacuum chamber. A wall of the vacuum chamber of the plant is angularly fashioned and is composed of a stationary part and of a swivellable part, the swivellable part being hinged to the stationary part. A door (ingot mold door) is provided in the swivellable part. The shape of the chamber wall and a linking axis of the swivellable part are fashioned or arranged, such that, when the chamber is opened, articles situated in the interior of the chamber are readily accessible. In comparison to the prior art, improved operations of the system, particularly regarding the chamber, is possible.