On the afternoon of July 25, 2025, at 2:15 PM, the South China Sea's Jinsha Beach was bustling with sunbathers under the scorching sun. Lifeguard Wang Hai's walkie-talkie suddenly emitted an urgent alarm: "The Dolphin-1 intelligent monitoring buoy has detected the formation of a rip current! Intensity level 3! Location: 150 meters offshore directly in front of Tower 3!"
The alarm sounded like an invisible bell, instantly tensing the nerves of all the lifeguards. Almost simultaneously, the scene in Wang Hai's binoculars confirmed the data: beneath the seemingly calm sea surface, a turbid, high-speed current was quietly forming, moving toward the deep sea. Within seconds, it had become like a lurking beast, beginning to drag several unsuspecting swimmers out to sea!
"Emergency evacuation! Area 3! Hurry!" Wang Hai's loudspeaker pierced through the roar of the waves. Over a dozen orange-clad figures darted into the shallow waters like arrows leaving the string, their whistles and shouts weaving a tight protective net. Within just a few minutes, over 20 tourists were swiftly guided to safe waters. A father, still shaken, held his child and stared at the suddenly dangerous sea, his voice trembling: "It was so sudden. The water seemed to have a suction force pulling people in... If the lifeguards hadn't arrived quickly, I dare not imagine the consequences."
Behind this miraculous escape from danger was the "Dolphin-1" intelligent monitoring buoy, silently standing hundreds of meters offshore. It functions like a stethoscope deep within the ocean's currents, continuously scanning the complex underwater flow patterns.
Rip currents are known as the "invisible killers of the beach"-narrow yet powerful currents that flow vertically toward the deep sea along the coastline. While the surface appears calm, the current speed can exceed 1.5 meters per second, far surpassing the swimming speed of the average person. Traditionally, lifeguards relied on visual observation and experience to assess risks, which was extremely dangerous. The core breakthrough of the "Dolphin-1" lies in its intelligent early warning system. It not only detects subtle abnormalities in current speed and direction in real-time but also combines historical data models to issue precise warnings 5-10 minutes before rip currents form and accumulate energy. Li Ming, Chief Engineer at the National Marine Technology Center, noted: "This is like equipping lifeguards with a '千里眼' (thousand-mile eye) to foresee risks. The system's accuracy in identifying the initial 'backwash' characteristics of rip currents has exceeded 92%, securing the golden window for intervention."
"This is its third successful intervention this month!" Chen Feng, the safety management director of Jinshatan Beach, pointed to the flashing monitoring buoy location icons and real-time water flow dynamics on the command center's large screen, his excitement evident. "In the past, by the time we detected a rip current, the person had already been swept away. Now, warning information is directly transmitted to the command center and lifeguards' handheld terminals, with positioning accuracy reaching the meter level, giving us the time to intercept risks and save lives." Since the deployment of this system, the beach has achieved "zero casualties" in rip current-related incidents.
The practice at South China Sea Jinsha Beach reveals a clear future vision: technological capabilities are being integrated into public safety defenses with unprecedented precision. Statistics show that the incidence of drowning accidents caused by rip currents in the relevant area has significantly decreased. Experts indicate that the precise prediction of rip currents by intelligent monitoring buoys not only ensures the safety of tourists but also provides important data support for marine research, offshore operations, and other activities, facilitating the rational development and utilization of marine resources. As this technology continues to be widely adopted, it is expected to bring revolutionary changes to safety protection in coastal regions worldwide.
