The US Navy submarine that struck an underwater object in the South China Sea last weekend was operating in one of the world's most difficult undersea environments, one filled with noise from ships above and a seabed with constantly shifting contours that can surprise any submarine crew, analysts say.


원문출처 : https://www.cnn.com/2021/10/08/asia/us-navy-submarine-south-china-sea-intl-hnk-ml/index.html