In "Through the Tunnel," the theme of maturity is central to Jerry's journey from childhood to adolescence. The story explores the complexities of growing up, highlighting the challenges and fears associated with this transition. Jerry's determination to swim through the underwater tunnel symbolizes his desire to prove his maturity and independence. The setting of the wild bay, with its dangerous and unpredictable nature, mirrors the tumultuous path of maturation, emphasizing that growing up is not a straightforward process.

After Jerry successfully swims through the tunnel, he feels a sense of accomplishment. He has proven his ability and demonstrated his "manhood," making the bay no longer important to him. The bay, once a symbol of challenge, becomes irrelevant as Jerry achieves his personal goal. This accomplishment signifies his transition from childhood to adolescence, fulfilling his need for independence and self-discovery. Jerry's satisfaction comes not from the approval of others but from his own sense of achievement.

The setting of the wild bay contributes significantly to the theme of maturity. The bay, with its "rough, sharp rock" and "stains of purple and darker blue," symbolizes the dangers and fears associated with growing up. Jerry's longing to fit in with the older boys, whom he sees as "men," drives him to face these challenges. The wild bay represents the independence and maturity Jerry seeks, but it also highlights the pain and fear that accompany this journey. Jerry learns that maturity is not always easy or fun, and he begins to recognize the value of safety and childhood.

The process of maturation in "Through the Tunnel" is depicted as non-linear and messy. Jerry's journey involves a back-and-forth movement between desiring independence and displaying childish behaviors. He experiences moments of maturity, such as his ability to delay gratification and make mature decisions, but he also reverts to childlike tendencies. This reflects the reality that growing up is not a straight path but a twisted and winding journey. Jerry's realization that he is not quite ready to be a man yet shows his acceptance of the complexities of maturation.

She was ready for a battle of wills, but he gave in at once. It was no longer of the least importance to go to the bay.

Ultimately, Jerry's experience at the wild bay teaches him about the challenges and fears of growing up. He learns that independence and maturity can be dangerous and scary, but he also gains a sense of satisfaction from his accomplishments. Jerry's journey through the tunnel symbolizes his rite of passage into manhood, but it also shows that maturity is a gradual process with setbacks and realizations along the way.