Send an SOS
If you need emergency help, you can press and hold the side button on the Apple Watch to pull up a new SOS feature.
After you hold this button, you will see a slider to send an SOS. This will connect you to emergency responders in your area without the need to get your iPhone out.
There is a countdown from three before the call is placed and you will need to be near your iPhone or connected to Wifi. The watch knows your location based on your iPhone and will call the appropriate emergency number, even if you are overseas.