Mooring buoy

A mooring buoy (1), comprising:

• a first body (10) capable of floating;
• a second body (20) placed under the first body (10), said first and second bodies being slidingly connected, said second body (20) being normally submerged when the buoy is in use and in a rest position;
• a connecting element (23) connected to the second body (20) and fixable to a mooring line of a vessel to be moored to the buoy (1),
• said connecting element (23) being housed in a seat (14) produced in the first body (10) and being movable, due to an effect of movement of the first and second bodies, between a retracted position, in which the connecting element (23) returns into a profile of the first body (10), and a protruding position, in which the connecting element (23) protrudes from the top end (13) of the first body (10) thereby enabling the mooring line to be fixed to the buoy (1);
• at least one chamber (22) located in any of the second body (20) and the first body (10);
• a fluid circuit (30) for feeding a fluid into the chamber (22) or, vice versa, for removing the fluid from said chamber (22) toward the outside;
• and
• a control unit (50) connected to said fluid circuit (24),
• wherein the control unit controls the fluid circuit (30) to vary an amount of said fluid in the chamber (22) so as to cause a variation of an immersion depth of the first body (10) with respect to the second body (20) or vice versa and, consequently, move the connecting element (23) between the retracted and protruding positions.