“U-Boat! The Rare Types”…..the title says it all.  The U-Bootwaffe of the Kriegsmarine had the largest submarine force at sea of any nation in history, before or since.  Naturally, everyone knows of the Type VII and its variants as well as the Type IX and its variants.  The Type VII and its variants are well known and there were hundreds of these boats built, commissioned and operational in the war.  This was the penultimate combat submarine.  The Type IX and its variants were the long-range boats that patrolled the world’s oceans with great successes.  Both the Type VII and IX boats will be profiled in other books to follow, but here we look at the boats the U-Bootwaffe thought about, designed a few, built some and experimented with others.  This book tells of these boats, their Skippers, their attacks and ultimate fates.