In the story "Through the Tunnel" what effect does the climax have on any of the conflicts in the story?
At the end of "Through the Tunnel," Jerry accomplishes what he has set out to accomplish: he travels through the underwater tunnel he discovered after seeing the older, native boys swim through it.
Perhaps the most simple and basic conflict in the story is the external struggle of man vs. nature--in this case, Jerry vs. the water. Obviously, Jerry is able to overcome this conflict through hard work, determination, and training (quite literally, he trains his body to survive under the water for a long enough time to swim through the tunnel).
More importantly, Jerry's internal conflict (he struggles to establish his independence while still clinging to his emotional bond with his mother) is resolved with the climax of the story. Once Jerry accomplishes his goal, he is able to feel the pride that accompanies such a task. Further, we can presume that since Jerry has accomplished his goal, he will be more secure in his relationship with his mother as the two leave their vacation and go home.