This app is for free diving. You can record with an Apple Watch Ultra a free dive and store the data in the app. 
The watch app will record the depth, the water temperature, the depth and the coordinates.For the disciplines DYN & DYN-B in pool also the distance will be recorded, minimum distance is 1 lane. A view with a chart of the dive is available.
You can set a surface time and a notification when you want to do repeating dives. The number of dives and the total time will be shown.
In the settings of the watch app you can select the discipline, starting depth, pool or outdoor, length of lane, surface time and start by button. On the watch the last 25 dives are as history available. You can send the dives to the iPhone by button (iPhone must be in receiving mode), select on iPhone the dive you want to store and confirm to send the chart data on your watch.

Currently the app records depth down to 6m ! The app is not a dive computer, the app will only record the data.

In the settings of your Apple Watch Ultra you can select the app for auto start (Generell -> auto start-> under water) and also to start the app by action button (Generell->action button->action(diving).

The iPhone App will store your dives on the iCloud Drive. You can store the dives in different lists, the systematic can be freely decided, as example different lists for discipline, month, name or location. Each list can contain a maximum of 100 dives. The lists can be sorted by different criteria like location, time, distance, depth,...
A view for the details of a single dive is also available as a view of a chart of the dive. A PDF for a single dive or the dive list can be created and printed.
You can store also your certificates and insurance in the app, they will be shown in the PDF of the list as well. A personalisation with photo, name and birth date can be done as well.

The app, iPhone or Watch, will send no data to any a third party. The data are only in your personal iCloud Drive stored.

Functions watch:
- current depth
- current time
- surface time
- max depth
- min / max water temperature
- distance for DYN & DYN-B (pool only min 1 lane)
- heart rate
- total time
- total # of dives
- set notification time during dive
- set notification time on surface
- start by action button
- training plan