On Apple Watch Series 10 and Apple Watch Ultra models, you can see summaries of your underwater activities in the Depth app. You can also review the summaries in the Fitness app on your iPhone.
WARNING: The Depth app is not a dive computer and does not provide decompression stop information, gas analysis, or other recreational scuba diving functionality.
The Depth app is supported on Apple Watch Series 10 to a maximum depth of 6 meters (20 feet).