Mark J. Harasymiw 
Life on a Submarine [PDF ebook] 

Few people could imagine living in an enclosed tight space for months at a time-but that’s just what those who serve in the navy on submarines do. They travel thousands of miles underwater on missions and become experts on all the systems that make submarines amazing and sometimes dangerous machines. Accessible text describes how submarines work and the many careers available for those interested in this kind of life. It also includes information about submersibles used for undersea exploration.