An invisible secret war quietly playing out beneath the waves
In the contested waters of the South China Sea and beyond, China's state security ministry has declared an 'invisible secret war' — alleging that foreign intelligence agencies are embedding sensors in marine animals and deploying autonomous underwater devices to harvest military secrets in real time. The claims, issued without named adversaries or photographic evidence, extend a long pattern of Beijing framing its surrounding seas as a theater of clandestine foreign intrusion. Whether or not the specific allegations hold, they reveal something enduring about the nature of modern geopolitical anxiety: that the ocean floor, like the sky above, has become a domain where nations imagine themselves perpetually watched.
- China's state security ministry alleges that sea turtles and fish fitted with electronic sensors are transmitting live ocean data — temperature, salinity, currents — to foreign powers via satellite.
- Beyond the animals, Beijing claims foreign-deployed buoys, wave gliders, and seafloor 'lighthouses' are actively tracking Chinese submarine movements and vessel activity in some of the world's most militarily sensitive waters.
- The allegations carry no named suspects, no disclosed locations, and no released evidence — leaving the claims suspended between credible concern and strategic messaging.
- To mobilize civilian eyes, Beijing is offering fishers rewards of up to 500,000 yuan for reporting suspicious devices, transforming ordinary maritime workers into the front line of a national surveillance effort.
- The South China Sea, East China Sea, and Taiwan Strait — already flashpoints of territorial dispute — are now cast by China's government as active arenas of invisible, ongoing foreign espionage.
China's ministry of state security issued a striking warning this week, alleging that foreign intelligence agencies are conducting an 'invisible secret war' in Chinese waters — using sensor-equipped marine animals to collect real-time military data. 'Spy turtles' and 'spy fish,' the ministry claimed, are gathering information on ocean conditions and transmitting it overseas via satellite. No foreign governments were named, no locations specified, and no evidence was made public.
The animal allegations sit within a wider set of claims. Beijing says it has also identified foreign-deployed buoys capable of tracking the acoustic signatures of Chinese submarines, unmanned wave gliders harvesting ship movement data, and underwater 'lighthouses' on the ocean floor said to guide foreign submarines through Chinese territorial waters — a claim first made in 2024.
The use of animals in naval operations is not without historical basis. Russia's deployment of trained dolphins at its Black Sea fleet base in Sevastopol was documented by British defense intelligence in 2023. China's claims are considerably more opaque, however, lacking the specificity or corroboration that would allow independent assessment.
To sustain public vigilance, Beijing has established a tiered reward system offering fishers between 50,000 and 500,000 yuan for reporting suspicious devices. The structure implies the government views underwater foreign surveillance as an ongoing and widespread problem — one that requires ordinary citizens to serve as its first line of detection. Whether the threat is as pervasive as described, or whether these claims serve a broader strategic purpose, the message from Beijing is unambiguous: the waters surrounding China are already a battlefield, and the enemy is already there.
China's ministry of state security issued a stark warning on WeChat this week: foreign intelligence agencies are waging what it called an "invisible secret war" in the waters surrounding the country, deploying animals fitted with electronic sensors to gather military secrets. The animals—described as "spy turtles" and "spy fish"—are allegedly collecting real-time data on water temperature, salinity, and ocean currents before transmitting the information overseas via satellite. The ministry did not specify where these creatures had been discovered or which foreign powers had equipped them, but framed the activity as a serious threat to national security.
The claim sits within a broader pattern of Chinese allegations about underwater espionage. Beyond the animals, the ministry said it had identified buoys deployed by overseas marine research institutions, equipped with sensors capable of tracking the acoustic signatures of Chinese submarines in real time. It also pointed to "wave gliders"—unmanned vessels powered by wave motion and solar energy—that it said were being used to transmit military-related maritime data and information about ship movements. Each device, in Beijing's telling, represents a piece of a coordinated foreign intelligence operation unfolding beneath the surface of contested waters.
The use of animals for military purposes is not without precedent. In 2023, British defense intelligence reported that Russia had deployed trained bottlenose dolphins at its Black Sea fleet base in Sevastopol, keeping them in floating pens to counter enemy divers. That operation was documented and acknowledged. China's claims about sensor-equipped marine life are more opaque—no photographic evidence has been released, no specific locations named, no foreign governments implicated by name.
The waters in question—the South China Sea, the East China Sea, and the Taiwan Strait—are among the most militarily sensitive and contested on Earth. China has made espionage allegations in these regions before. In 2024, it claimed to have discovered underwater "lighthouses" positioned on the ocean floor, devices it said could guide foreign submarines through Chinese waters and "pre-set the field for battle." Each new claim adds to a narrative of constant, invisible threat.
Beijing has created a financial incentive structure to encourage the public to participate in this surveillance hunt. Fishers who report spying devices can receive rewards ranging from 50,000 to 500,000 yuan—roughly £5,500 to £55,000. The tiered payment system suggests the government views this as an ongoing problem requiring sustained vigilance from ordinary citizens. Whether the animals and devices described actually exist, whether they are as widespread as implied, or whether they pose the threat Beijing claims remains unclear. What is clear is that China's security establishment sees the waters around it as a battleground where foreign powers are already operating, and it is mobilizing its population to help identify and expose them.
Citações Notáveis
Foreign agencies are collecting sensitive data through a variety of new spying devices to produce underwater maps that pose a serious threat to national security— China's ministry of state security
A Conversa do Hearth Outra perspectiva sobre a história
Why would foreign intelligence agencies use animals instead of just deploying more conventional underwater drones or submarines?
Animals are harder to detect and easier to explain away. A turtle swimming in the ocean looks like a turtle. A drone is unmistakably a device. If something goes wrong or is discovered, there's plausible deniability—it could be a research project, a conservation effort, something innocent.
Has anyone outside China verified that these spy animals actually exist?
Not that we know of. No photographs, no captured specimens, no foreign government has acknowledged the program. That's part of what makes this tricky—China is making a claim about an invisible war, and the invisibility is built into the claim itself.
The financial rewards for reporting—50,000 to 500,000 yuan—that's a huge range. What determines the payout?
The source doesn't say. But the spread suggests they're pricing different types of devices differently. A small sensor might be worth less than a sophisticated buoy or wave glider. It's also a way to make the public feel like they're part of the security apparatus, like they have a stake in defending the nation.
Is China the only country making these kinds of claims?
No. Russia did it with dolphins, and that was documented. But Russia was open about it—they said the dolphins were there to protect their base. China is describing something more shadowy, more pervasive, and it's not acknowledging who the foreign actors are.
What's the actual military value of knowing water temperature and ocean currents?
It's enormous. That data helps you understand how sound travels underwater, how to hide a submarine, how to detect one. It's the difference between operating blind and operating with a detailed map of the environment. That's why China treats it as a national security threat.