Although not pertaining to the Pacific war one of the best books I have read in years is titled Shadow Divers. Don't remember the author but it is a recently written book. The book tells the story of a group of wreck divers who discover a sunken U-boat off the coast of New Jersey where no records indicate one should be. It provides a fascinating look into the world of deep wreck diving and it's hazards. The divers struggle to identify the U-boat that is at a depth of 250 feet. Much of the story takes place before the use of Tri-Mix so it was quite dangerous. The story also weaves together the story of the crew of the U-boat with information and photos from surviving family members and German archives. It is a touching portrait of a mostly young 18-21 year old crew on their first mission at a time in 1945 that going to sea in a U-boat was almost a suicide mission.
For anyone interested in the history of the U-boat War check out the website
http://www.uboat.net One of the best sites dealing with WWII that I have seen with daily updates and new information constantly being added.