In "Shadow Divers," Robert Kurson recounts the thrilling journey of two American divers who dedicate themselves to uncovering a significant World War II mystery. Their quest leads them deep into the ocean's depths, where they face not only physical challenges but also the weight of history and the lives lost during the war. The narrative highlights the courage and determination of the divers as they navigate both the underwater world and their personal fears.

A poignant moment in the story reflects on the idea of excellence and fulfillment. When the protagonist pauses to rest against a tree, he is struck by the profound richness of life that emerges from pursuing excellence. This sentiment underscores the theme of the book, illustrating how the journey for knowledge and adventure can lead to a deeper appreciation for life itself.