Control of equipment- air. For the memory- a few rules of checking equipment before immersion. The most important thing is to control the amount of air breathing automat (first and second stage). Statistics show that major cause of diving accidents- were not control the amount of air.
So turn- pinning and fix the cylinder to BCD. Raise the handle BCD- check the mounting cylinder. Jacket should protects the pressure gauge and just unscrew the valve. In case of damage of pressure gauge doing so protects face and eyes from shattered glass. Check the amount of air in the cylinder-standard 200 bar, there are also sets of equipment with a certificate of up to 300 bar. Then take the machine into the mouth and make a few breaths- pressure gauge needle cannot move. If it moves, either the cylinder is not open properly, or automat of the first level required review in service. Just control the octopus.
Example of a night dive in Safaga. After checking the octopus turned out that the press box reducer is all about breath test showed only that the octopus does not give the air. In a night diving- poor light, difficult controls the amount of air in the cylinder- ready emergency situation or accident.
After checking the breathing automat- control and relief valves inflator BC. For the safety the procedure should be repeated before immersion, in water.