Chinese Navy's nuclear-powered submarine Long March 11 takes part in a naval parade off the eastern port city of Qingdao, to mark the 70th anniversary of the founding of Chinese People's Liberation Army Navy, China, April 23, 2019. REUTERS/Jason Lee/File Photo Acquire Licensing Rights HONG KONG, Oct 9 (Reuters) - A submarine arms race is intensifying as China embarks on production of a new generation of nuclear-armed submarines that for the first time are expected to pose a challenge to growing U.S. and allied efforts to track them. Analysts and regional defence attaches say evidence is mounting that China is...