Just as promised here is the "must read" I've been eluding to in other thread. Shadow Divers is a very good book. The true story of two American ship wreck divers who discover a WWII U-boat sunk in the Atlantic just off the coast of New Jersey. The twist is there is no historical record explaining the subs presence in American waters or how it got there. The story details how these divers risked everything including their lives to discover the truth and in fact change history!
A great read. This book has a bit of mystery, science, history, tragedy and suspense and it's non-fiction!
You really ought to check it out.
Hershey