Especially when diving in cold waters, there is a risk of the regulator freezing. To counteract this, you should use models that are suitable for cold water, but the configuration also plays an important role here. It is clear that the configuration taught in the basic course, which consists of a single regulator, is not the optimal solution. So take a look at the video to see what configuration options are available and how they differ. Feel free to leave me a comment with your configuration.
Thanks to @frankostheimer2949 for his support.
The video on how gases behave under pressure can be found here - Gases under pressure: https://www.youtube.com/watch?v=42wY9MrdrjY