China's nuclear submarine has maintained an amazing safety record with no accidents in more than forty years.
A senior navy officer says a nuclear submarine is like a mobile nuclear power station, and its reactors must meet strict safety standards. At base, crew members conduct weekly checks on equipment.
Taking a nuclear submarine out of service is also a challenge. The Chinese navy has been conducting research on that since 2000, and has detailed plans for dismantling facilities, the disposal of nuclear waste and other key issues.
China is now the second nation in the world to have dispose of retired nuclear submarines safely.