The invention relates to a device (2) for installing and handling a module of an underwater treatment station, comprising a frame (4) intended to be fixed to a module (6), feet ( 14), and a hydraulic system comprising hydraulic jacks (18) each comprising a jack body, and a piston intended to be brought into contact with a foot and movable inside the jack body between a first mechanical stop corresponding to a deployed position of the piston and a second mechanical stop corresponding to a retracted position of the piston, the piston separating the internal volume of the cylinder body into a first chamber and a second chamber, the first chamber being supplied with hydraulic fluid by two independent hydraulic circuits comprising a damping circuit able to move the piston between the first mechanical stop and a hydraulic stop corresponding to an intermediate position of the piston located between the deployed position and the retracted position, and a controlled lowering circuit capable of moving the piston between the hydraulic stop and the second mechanical stop.
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