U Boats of the Second World War. Their Longest Voyages, Paperback

Ocean-going U-boats, each one not much longer than four European articulated trucks with up to 60 men inside them, sailed the far-off seas to reap havoc in inhospitable waters. The book is based on previously unpublished documents from the German U-boat Museum, many of them written during or shortly after the war by men who survived the conflict.