In no particular order, these are the books from my bookshelf that I really like......

Finding and identifying a pirate ship is the hardest thing to do under the sea. But two men—John Chatterton and John Mattera—are willing to risk everything to find the Golden Fleece, the ship of the infamous pirate Joseph Bannister. At large during the Golden Age of Piracy in the seventeenth century, Bannister should have been immortalized in the lore of the sea—his exploits more notorious than Blackbeard’s, more daring than Kidd’s.
This is one of a couple of books that tell the story of the US Navy hardhat divers of the 1920's, and their work on the S-51 submarine salvage. It is a great read.
If you only read one book on Titanic, this should be it. Wyn Craig Wade makes a brilliant analysis of not just what happened, but what it all meant culturally.

Brad Matsen's account of the last manned expedition to Titanic, led by Richie Kohler, Kirk Wolfinger, and myself, in the summer of 2005. Our discovery of new wreckage changed what we know about Titanic.

Brad Matsen's biography of the most famous diver of all time.
Rob Kurson is a good friend, and a brilliant writer.
The story of Chris and Chrissy Rouse is disturbing, but absolutely fascinating. Bernie did a great job.
The power of thinking without thinking, is how they describe it. Interesting theory for divers..

This is Brad's book about the first men to see the deep ocean.

A modern analysis of the metallurgy of Titanic, with some opinions on how she sank.
Adventure and Death Diving on the Andrea Doria. The title pretty much says  it all.

Deep dark and dangerous diving on the Andrea Doria, from the Seeker. This is a story about a very dangerous time to be diving the Doria.

Modern martial philosophy on life, and living. One of my favorite books.
The fascinating U-Boat classic.
The reference book that gives the ultimate accounting of the U-Boats.
Seventeenth century martial philosophy from Japan.
Great photos, and detail drawings for Type IX U-Boats.
 Great photos, and detail drawings for Type VII U-Boats.
  Story of the US submarine, USS Lagarto, lost with all hands in World War II.
 Brilliant book on the Pearl Harbor attack.
 Amazing account of the intelligence war, in World War I.

 The Titanic Classic

Fascinating, account of the U-Boats of World War I, and the men who sailed them, by adventurer Lowell Thomas. Classic!

 Dan's work on the wrecks of Truk Lagoon
  Fascinating account of  gold, greed, and government intervention.
 There is no better book on pirates and buccaneers, than this amazing first hand account from the 1600's.
 This book tells the story of the Pizarro brothers, and the Inca. It is an amazing read, and absolutely fascinating history.
 Great story of the early Chinese exploration of the Americas.
 The New World, before it was the New World.
 Great story of the USN submarine S-5, and the amazing survival of her crew.
 The history of the Uboats in World War I is absolutely fascinating, and this book is one of my favorites.

My friend John Mattera's book on gun fighting.

 This is the ultimate reference work on the history of German submarines.
 Amazing reference work that includes every U-boat attack reported.
Rob Kurson's followup book to Shadow Divers.
Delay can make a good decision bad, or a bad decision good. Interesting book for decision makers.
When the U-boats came to America, A classic about the U-boats, and the U-boat sailors of World War I who dared to cross the Atlantic.
German Warships, 1815-1945: U-boats and Mine Warfare Vessels v. 2 (Conway's Naval History After 1850) This is the ultimate reference book on every U-boat, planned, built, or sailed.