The book "Sub-Merge: Living Deep in a Shallow World" by John B. Hayes is a compelling read that encourages readers to engage deeply with the world's challenges. Hayes, a dedicated Christian, shares his experiences living among the poor and the importance of authentic faith in addressing social issues. The book is a call to action for individuals and organizations to work towards justice and alleviate suffering through compassionate service. It offers practical ways to find significance in the process and emphasizes the transformative power of living out one's faith authentically.