Defence researchers say sensors identify extremely small surface vibrations produced by a low-frequency sound source in the open sea.
Chinese scientists look to 6G to hunt submarines, testing device small enough to fit on drone
RELATED ARTICLES
China names lunar crater after Manhattan Project physicist Chien-Shiung Wu
Unique bus trip sees China student spend just US$110 on fares from Beijing to Hong Kong
More measures urged as Hong Kong university students lose HK$75 million to scams
