Nice boat. Looks like it's a Static diving not Dynamic type. Dynamic diving relies on boat's forward momentum and diving planes to dive. Static diving the boat relies on ballast tanks to dive and surface even if stationary.
Yes indeed. It was my mistake yesterday when I have typing the details about the submarine. I was so tired, that I have wrote down that the sub is Dynamic dive instead of Static. I go quick into the description and modify quick. It is a great Rc submarine indeed. Thanks you for taking your time to watch my clips :)