
China’s SQUID Gravity Detector Moves Closer to Spotting US Nuclear Submarines
China’s Chinese Academy of Sciences has unveiled a compact gravity detector that moves closer to spotting US nuclear submarines. The device uses a SQUID and superconducting suspension to measure tiny gravity shifts, achieving 0.02 E accuracy — approaching the 0.01 E needed for submarine detection. It evades the limits of sonar and radar because gravity cannot be masked. Major hurdles remain for airborne use.














