Do you know that Apple Watch Series 2 and later versions are all water resistant. These also offer perfect solution for swimming workouts. The screen of an Apple Watch locks automatically right after your swimming workout begins. It is known as Water Lock that prevents any accidental tap on the screen.
When you activate the Water Lock, the green water droplet sign appears on Apple Watch display. If you want to deactivate Water Lock, you can turn the Digital Crown so you can easily unlock the screen. You can manually activate the Water Lock and the water clearing process on your Apple Watch under Control Center by using the water lock.