China’s Ministry of State Security says foreign intelligence agencies are using sensor-equipped marine animals—described as “spy turtles” and “spy fish”—to monitor areas near China’s coastline. In a statement posted on Chinese social media, the ministry alleges that these devices are attached to sea creatures to collect what it calls “sensitive marine data.” It adds that the information is used to help create underwater maps and to identify potential weaknesses in China’s coastal defences. Several outlets report the ministry characterizes the activity as part of an “invisible secret war” unfolding in Chinese waters. The warnings are framed as an apparent reference to Western competitors, though the ministry does not name specific countries or agencies. The claim is presented as a security warning by Beijing and has not been independently verified in the reporting. The allegations focus on the purported use of tracking and monitoring equipment deployed via marine life as a means of gathering intelligence in the underwater environment off China.