None of us live forever. Thousands of the vets are dying every day. Their history and thier memory will always remain, as long as we remember.
To get a feel of how these guys lived, read Thunder Below, by Eugene Flukey. A great book that reads like a novel. Flukey won the MOH.
Clear the Bridge, by Richard O'kane. A fighting sub during the early part of the war, by one of the most successful commanders.
Silent Victory By Clay Blair, Jr. A history of undersea WWII boats.