Abstract: A cover arrangement together with a displacement mechanism for a swimming pool having a basin (1). The displacement mechanism moves the cover vertically inside the basin (1) of the swimming pool between two extreme positions. One position is a bottom (7) and the other position is a surface of the pool. The cover arrangement comprises sealing shutters which are movably supported on a support structure (9) in such a way that they can occupy an open position and a closed position. The support structure (9) is provided with plurality of partitions, each of which can be sealed by at least one shutter. The displacement mechanism is also suitable to position and maintain the supporting structure (9) in at least a third position situated between the extreme positions.