A retractable turret rotatable on a platform, including an active system orientable in vertically extendable elevation, and in azimuth, a protective cowling for the active system and for closing a caisson, wherein the turret includes, for vertically extendable deployment and rotation of the active system, first and second arms forming a deformable quadrilateral on either side of the active system, a first manual means for controlling deployment of the active system by activating the first arm, and a second manual means for controlling the orientation in vertically extended elevation and in horizontal azimuth of the active system by moving the second arm.