To use Water Lock on Apple Watch, simply click the side button to bring up Control Center, scroll down, and tap the water drop icon.
When Water Lock is enabled, the Apple Watch doesn't respond to touch on its display to prevent accidental input while in water.
To unlock an unresponsive Apple Watch in Water Lock mode, press and hold the Digital Crown for a few seconds to eject water and restore functionality.
While the Apple Watch is water-resistant, it is not recommended to expose it to soapy water, perfume, high-velocity water, or use it in steam rooms and saunas.