What is jerry's movtivation in through the tunnel?

In "Through the Tunnel" by Doris Lessing, Jerry's primary motivation is to assert his independence and prove his capabilities as he transitions from childhood to adolescence. He desires to overcome the challenges posed by the tunnel, which symbolizes both a physical and emotional barrier. By successfully swimming through the tunnel, Jerry seeks validation and a sense of accomplishment, ultimately striving to establish his identity apart from his mother and his previous limitations.