The submarine was as formidable a weapon for the Royal Navy in World War II as for the other main combatant nations. The first half of this book explores the conception, design, development and subesequent evolution of the three major classes: the "S," "T," and "U."

The "S" Class submarine was originally conceived in the 1920s, specifically for deployment in narrow seas. As the war progressed the submarine was modified to increase its diving capability and fuel-carrying capacity, and radar and many other features were added. The "S" Class served in all theaters from the North...

Over the last 30 years, hydrographical marine surveys in the English Channel helped uncover the potential wreck sites of German submarines, or U-boats, sunk during the conflicts of World War I and World War II. Through a series of systemic dives, nautical archaeologist and historian Innes McCartney surveyed and recorded these wrecks, discovering that the distribution and number of wrecks conflicted with the published histories of U-boat losses. Of all the U-boat war losses in the Channel, McCartney found that some 41% were heretofore unaccounted for in the historical literature of World...