The Japanese Lifesaving Association conducted a training demonstration to show how powerful rip currents can quickly overwhelm swimmers [1].
These currents, referred to as Ianryu or “death water flow,” pose a significant risk to beachgoers. The exercise highlights that swimming directly toward the shore during such an event is often futile and can lead to rapid exhaustion and drowning [1, 2].
During the demonstration on a Japanese beach, trained rescue experts and participants attempted to swim against the current. Despite their training and physical conditioning, the participants struggled to make progress. A rescue worker said a participant should swim with all their strength, but the current remained dominant [1].
One training participant eventually conceded the effort, saying, "It's no use" [1]. The exercise served as a visceral reminder that human strength is often insufficient against the volume and speed of a rip current. The association used the simulation to educate both the public and rescue personnel on the hazards of the water to prevent drowning incidents during the swimming season [1, 2].
Another participant noted that they had rarely experienced the actual dangers of underwater currents until this exercise. The participant said they were glad to have the opportunity to attempt the swim in a controlled environment to understand the risk [1].
Experts emphasize that the instinctive reaction to swim back to the beach often pulls a person further out to sea or exhausts them before they can reach safety. The Japanese Lifesaving Association aims to replace this instinct with knowledge of how to survive these currents by swimming parallel to the shore, or floating until the current weakens [1, 2].
“Even trained experts quickly become exhausted and risk drowning when trying to swim toward the shore.”
The demonstration underscores a critical gap between perceived swimming ability and the physical reality of ocean currents. By showcasing the failure of trained experts to overcome 'death water flow,' the Japanese Lifesaving Association is shifting public safety messaging from general caution to a specific warning about the physiological impossibility of fighting a rip current head-on.
