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

Chinese scientists have created a Hall‑effect magnetic sensor so sensitive that it could detect a submarine from 500 metres away. Photo: Shutterstock

Picture a fisherman hauling in his nets on a calm morning at sea, when his smartwatch suddenly vibrates with an alert: “Magnetic anomaly detected – possible submarine passing 500 metres below.”

Far‑fetched as it sounds, Chinese scientists have just taken a decisive step towards making that scenario real.

A team from the Hefei Institutes of Physical Science and the Ningbo Institute of Materials Technology and Engineering, both under the Chinese Academy of

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