Chinese magnetic sensor breakthrough may help smartwatch detect submarine 500 metres deep

Chinese scientists have developed a highly sensitive Hall-effect magnetic sensor, no larger than a grain of dust. This breakthrough, achieved by a team from the Hefei Institutes of Physical Science and the Ningbo Institute of Materials Technology and Engineering, could theoretically detect the magnetic signature of a submarine up to 500 meters deep. The sensor's extreme sensitivity suggests potential applications such as enabling smartwatches to alert users to the presence of submerged submarines. This advancement represents a significant step towards making such detection capabilities a reality.