China's first manned deep-sea research submersible Jiaolong conducts an equipment test mission in Chinese territorial waters following a technical upgrade this year. [Photo provided to China Daily ...

NR-1 is the navy's smallest nuclear-powered and only nuclear-powered research submarine. Launched in 1969, th 145' NR-1 (known affectionately as Nerwin) was designed for deep submergence work on the ...