The Philippine Coast Guard (PCG) has taken custody of an alleged underwater drone recovered by local fishermen in the waters near Brgy. Barangonan, Linapacan, Palawan. This incident highlights ongoing illegal marine scientific research in Philippine waters, amid a pattern of similar events involving foreign-origin autonomous underwater vehicles (AUVs).
On September 28, 2025, fishermen from Sitio Tapic, Brgy. New Colaylayan, Linapacan, discovered the approximately 12-foot-long device during routine fishing operations. Later that evening, they turned the AUV over to Coast Guard personnel. The alleged drone had been safely transported and secured at PCG Station Linapacan for further verification, technical examination, and investigation, in coordination with relevant national security agencies.
Preliminary observations show that the device features a Conductivity-Temperature-Depth (CTD) sensor—a compact probe designed to measure seawater salinity, temperature, and depth, which are key parameters for oceanographic profiling. The sensor includes Chinese labeling (“海水盐度传感器”) and a serial number (CTD-20090334), along with visible corrosion from prolonged saltwater exposure. It is mounted on a rugged metal frame, typical of components in autonomous underwater vehicles commonly known as “underwater drones.”
This recovery fits into a series of similar incidents in Philippine waters dating back to July 2022, including devices found in Pasuquin, Ilocos Norte (July 2022); off the Zambales coast (September 2022); Calayan Island, Cagayan (August 2024); Initao, Misamis Oriental (October 2024); and San Pascual, Masbate (December 2024). At least three of those prior recoveries have been linked to Chinese deployment, based on evidence such as China Telecom SIM cards, iridium transceivers connected to Beijing-based HWA Create (a defense contractor), and battery packs marked by China Electronics Technology Group Corporation.
Previous forensic analyses of similar recovered AUVs have identified them as tools for advanced underwater surveillance and seafloor mapping. The integrated CTD sensor allows for the collection of data on salinity, temperature gradients, depth, and acoustic propagation—essential for bathymetric charting and environmental monitoring. Recovered units have shown capabilities for autonomous data processing, storage, and satellite transmission, with one case revealing encrypted communications to mainland China during operations.
“The Philippine Coast Guard remains vigilant in safeguarding our maritime domain and protecting the livelihoods of our fisherfolk,” said PCG Commandant, Admiral Ronnie Gil Gavan. “We commend the quick action of the local fishermen for reporting this find. This incident highlights the need for continued community awareness and a whole-of-nation approach to deter unauthorized activities in our waters.“
The device is undergoing detailed forensic examination to determine its exact origin, operational history, and potential security risks. The public is urged to report any suspicious maritime objects to the nearest Coast Guard station.
