A device for the extraction of a submerged rope used to moor a boat, includes a rigid bar having joined thereto: a rope, the lower end of which is solidly connected to a mooring post; a water hose which is connected to a water supply at the port and which is used to supply water next to the tip of the rope; an inflatable element; and an element for limiting the course of the rigid bar upon inflation of the inflatable element, in order to maintain the assembly on the water bottom when the inflatable element is deflated and in order to remove the rope and the hose from the water to an adjustable height in relation to the level of the water when the inflatable element is inflated. The rigid bar can be a telescopic bar and, as such, the length thereof can be adjusted. In addition, the rigid bar can be raised with a hydraulic arm.