1. Learn how to breathe.
This is a little bit of a difficult suggestion, as a person on the significant rules of scuba diving is always to hardly ever hold your breath.
Breathe in a natural way. It may seem counterintuitive, but the much more you concentrate on how you might be respiratory, the speedier you will use your air. The simplest way is concentrating focus on what you see and doing in water rather then focus on respiration. You are SCUBA diving, love the experience!
Since you might be maintaining neutrally buoyant , you control your breathing .It is alright to concentrate in your respiratory sometimes for this objective.
In underwater , its not recomended to hold your breath for more than a second or two. This dangers each lung overexpansion accidents (i.e. popping like a balloon), and messing along with your blood CO2 concentrations.