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James Prudenciano, 28, went for a walk at Hartshorne Woods Park in New Jersey. Here they were going towards the highest elevation. During this time, their balance deteriorated, causing them to fall into the river. He was badly injured by this. While falling down, the 'fall detection' feature of his Apple Watch became active. Because of which he dialed 911 number. James was later rescued.
In Apple Watch Series 4 and Series 5, the next-generation accelerometer and gyroscope are more powerful. Custom algorithms use data from both sensors to analyse wrist trajectory and impact acceleration so that the Apple Watch can determine if and when a hard fall has occurred.
When an incident like this occurs, a hard fall alert is delivered to the Watch, and a call is initiated to emergency services. If Apple Watch detects you have remained motionless for one minute, an emergency call will be placed automatically and a message with your location will be sent to your emergency contacts.