China tested a handheld submarine detector. It tracked a subway train underground
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Source: South China Morning Post
Published: 2026-09-25 12:00 UTC+10:00
Section: General
Factuality Score: 100
Opinion Category: Neutral
Topics: Science, Asia, China, World News, Asia Pacific
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Snippet:
The tiny device is the size of a pencil and uses just 5 watts of power but can record a train braking into a station under a city street
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