German Lifeguards Test A Low-Flying Drone To Save Swimmers

Popular Science 

For a swimmer struggling to stay above the water's surface, even a low-flying robot may offer some glimmer of hope. Even better is if that drone carries a self-inflating flotation device, keeping the swimmer afloat in time for lifeguards to drag them back to the shore. After alerting a lifeguard to swim out, the drone is piloted to the struggling swimmer.