SwimTrack: Drowning Detection using RFID.

Drowning is a leading cause of unintentional death worldwide. To ensure safe swimming, we introduce SwimTrack, a drowning warning system based on the Radio-frequency identification (RFID) technology. Swimmers only need to wear a wristband equipped with an RFID tag. SwimTrack is a low-cost device, achieving robust, quick drowning detection. The key observation is that the tag will not be readable as soon as the swimmer's hand (with a wristband) goes below the water surface. Our real-world experiments in a swimming pool show that SwimTrack can detect drowning events with an accuracy of 100% over 17 tests.