The USS Arizona and the HMS Hood were two of the most powerful warships in history, but their weaknesses paid a fatal price; experts investigate evidence that may reveal why the age of the battleship has come to a sudden and violent end. Also studied are Bismarck, HMS Prince of Wales, and Yamato. 

More than 50 massive warships of the German High Seas Fleet were scuttled in a matter of hours in the Scottish natural harbor of Scapa Flow during WWI. Thirty-eight were later salvaged. Now, marine archaeologists use cutting-edge tech to explore one of the greatest acts of defiance in wartime history.