深海藏“谍”！渔民多次捞到“间谍鱼” 专家：发现可疑设备要立即报告

Group 1 - The article highlights the increasing threat posed by foreign espionage activities in China's coastal waters, particularly through the use of advanced surveillance devices like acoustic sonar buoys and underwater drones [1][7][20] - Fishermen in Jiangsu province have reported encounters with suspicious devices, which are believed to be used for gathering sensitive maritime data that could compromise national security [1][3][22] - Experts emphasize the importance of reporting any discovered suspicious equipment to local authorities, as these devices are designed to collect military and economic intelligence [20][24] Group 2 - Acoustic sonar buoys are small, lightweight devices that can identify and track submarines, transmitting information to anti-submarine aircraft for precise targeting [3][5][20] - New technologies such as wave gliders and underwater drones are being utilized for intelligence gathering, capable of collecting data on water temperature, salinity, and other oceanographic parameters relevant to military operations [13][16][18] - The presence of these surveillance devices poses significant risks to China's military and economic security, as they are often disguised as scientific research equipment [22][24]