China's Spy Animal Warning
China Alleges Foreign Powers Use 'Spy' Animals For Coastal Defense Mapping
Key Points
The ministry also alleged it found “buoys deployed by an overseas marine research institute” equipped with a meteorological sensor package, which it said could track the “acoustic signatures of Chinese submarines in real time.”
China’s warning was posted on social media under the title “Under the deep blue, undercurrents are surging,” and the post included a dedicated section labeled “spy turtles, spy fish.”
To argue the allegations are not new, the Guardian report said Britain’s 2023 intelligence assessment described Russia training bottlenose dolphins kept in floating pens at Sevastopol’s harbor to “counter enemy divers.”
In the warning, Beijing did not name a specific country; instead it framed the threat as coming from “Western competitors,” according to reporting on the ministry’s post.
China's Ministry of State Security is warning that foreign spies are strapping sensors to sea turtles and fish to secretly map its coastline. The agency posted the alert on June 12, 2026, under the title "Under the deep blue, undercurrents are surging," according to Global Times, with a dedicated section labeled "spy turtles, spy fish."
The ministry said the animals carry satellite-linked devices that beam back water temperature, salinity, and ocean current data in real time. That information, Beijing claims, helps foreign agencies build underwater maps that could expose weak points in China's coastal defenses. No independent evidence was provided, The Guardian reported.
What the Sensors Allegedly Collect and Why It Matters
Water temperature, salinity, and current data sounds harmless. But experts say it is exactly what a navy needs to hide — or find — a submarine. Accurate sonar depends on knowing how sound moves through water, and that changes constantly with ocean conditions, according to Thairath English.
The ministry also alleged it found buoys placed by "an overseas marine research institute." Those buoys, it claimed, carried sensors that could track the acoustic signatures of Chinese submarines in real time. An acoustic signature is the unique sound a submarine makes — capturing it gives a foreign navy a critical edge in undersea warfare, according to The Standard.
Spy Fish Are Just One Piece of a Bigger Alleged Spy Network
Marine animals are only part of what Beijing described. The ministry also alleged that foreign agencies use solar-powered "wave gliders" — small autonomous boats that drift on the surface — to track naval vessels. Hidden sensors on cargo ships are allegedly used to monitor activity in Chinese ports, according to AFP.
Beijing did not name a specific country. It framed the threat as coming from "Western competitors." Analysts and reporting point to the Five Eyes alliance — the U.S., UK, Canada, Australia, and New Zealand — as the likely implied target, AFP noted.
Using Animals as Spies Has Real Historical Precedent
The idea of military animals is not new. Britain's 2023 intelligence assessment described Russia training bottlenose dolphins at Sevastopol harbor to counter enemy divers. The dolphins were kept in floating pens to guard the Black Sea fleet base, according to The Guardian.
The U.S. Navy has run its Marine Mammal Program since 1959, using dolphins and sea lions for mine detection and harbor protection. Scientists also regularly tag turtles and fish with tracking devices for legitimate environmental research — a fact that leads some analysts to suggest China may be mischaracterizing routine marine biology as espionage, DW News reported.
China Offers Big Cash Rewards to Fishermen Who Find Spy Gear
The ministry urged Chinese fishermen to report any suspicious floating devices in the water. It is not just a request — the government backs it with money. Fishermen who locate and hand over foreign surveillance equipment can earn between 50,000 and 500,000 yuan, or roughly $6,900 to $69,000 USD, according to The Standard.
The warning comes as espionage accusations fly in both directions. Just days earlier, the Five Eyes intelligence alliance warned that Chinese operatives were using platforms like LinkedIn to recruit sources with access to sensitive information. Beijing's "spy turtle" post fits a broader pattern of tit-for-tat spy claims between China and Western nations, The Guardian reported.
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