On July 30, 1945, the USS Indianapolis was torpedoed by a Japanese submarine. Over 800 sailors were stranded on the open sea, facing devastating conditions and hungry sharks. Only 316 sailors were rescued. The final resting place of the Indianapolis was a mystery - until 70 years later when new technology and research led to a breakthrough, in this episode of History’s Greatest Mysteries: Solved, a new History digital original series. | HISTORY

Top 10 Biggest Submarines in the World Most of the world's biggest submarines are Russian. Submarines are expensive. During the Cold War, the United States invested heavily in submarine technology to counter a much larger Soviet submarine force. Technological superiority proved a winning but expensive strategy. How expensive is hard to say. Determining the cost of any advanced military technological system produced in relatively small numbers raises complex problems. There are no price lists for