A watertight door or window comprising a frame and a leaf mounted on the frame and arranged movably with respect thereto between an open position and closed position, and further comprising: a striker element arranged on the leaf, a locking element arranged on the frame and provided with a hook end designed to engage with the striker element so as to lock the leaf against the frame following closing of the leaf, and a striker actuating mechanism arranged on the leaf and able to be actuated when the leaf is in a closed position and the locking element is engaged with the striker element. The actuating mechanism is provided for releasing the striker element from a closed position, where the striker element is positioned inside a recess in the hook end of the locking element, to an open position, where the striker element is extracted from the recess in the hook end of the locking element. The actuating mechanism can be reset when the leaf is closed again.