After 60 years in a watery Hawaiian grave, two World War II-era Japanese attack submarines have been discovered near Pearl Harbor, marine archaeologists announced today. Specifically designed for a stealth attack on the U.S. East Coast--perhaps targeting Washington, D.C., and New York City--the "samurai subs" were fast, far-ranging, and in some cases carried folding-wing aircraft, according to Dik Daso, curator of modern military aircraft at the Smithsonian's Air and Space Museum, speaking in the new National Geographic documentary Hunt for the Samurai Subs. When World War II ended in 1945, the U.S. Navy seized the Japanese fleet in the Pacific,...