Abstract: Disclosed is a simulator for training in environments confined and/or suspected pollution consists of a container having a base, a roof opposite the base, and short perimeter walls and long with at least one vertical manhole, a horizontal manhole and two safety exits to the outside. The two long perimeter walls delimit a plurality of internal compartments for the exercise of the personnel with equipment that create effects for the training activity, and at least one training activity control, command and management cabin with operator present. The internal compartments for the personnel training are at least partially separated by way of movable walls disposed transversely to the two long perimetral walls. The movable walls have adjustable passage openings through sliding partitions.