Deep diving is not always the most fun; many times you can also enjoy and have a good time in shallow waters, avoiding obstacles and practicing buoyancy without reaching 2 atmospheres (which would be 10 meters deep).
In fact, if you leave this practice for the end of the dive, when you have few air in the tank (as was the case), this "a priori" simple practice will become more complex, since the volume of air in your tank will be expanded and it will always try to take you to the surface even if you carry the correct lead weight.
Here we were about 8 meters deep, so the pressure was 1.8 atmospheres (1,823 bar).
Video recorded with a GoPro Hero 4 Adventure.