[underwater exhalation]
Whenever you put a regulator back in your mouth underwater you need to clear it before you can breathe from it again.
This is perhaps the simplest and most dangerous of all the skills you will have to perform.
The most important rule in scuba diving is: never hold your breath.
If you hold your breath while you ascend, the gas will expand and can seriously injure or kill you.
This is why any time a regulator comes out of your mouth you must blow a steady stream of bubbles.
This has to be a habit and needs to be performed from muscle memory.
It has to happen without thinking in order for you to be a safe diver.
Never hold your breath when you're scuba diving.
In this video we are going to demonstrate the two methods for clearing a second stage.
The first method is the blast method
and the second method is the purge method.
Remember: any time a regulator is out of your mouth you must blow a steady stream of bubbles.
This is the blast method. Take the regulator out, point it mouthpiece down so that it doesn't free flow...
...steady stream of bubbles...
To clear the second stage, you simply cough forcefully through it.
The purge method, when you take the regulator out
... make sure you blow a steady stream of bubbles....
when you put the regulator back in, put your tongue in the hole of the mouthpiece
before you push the purge button.
When you push the purge button,it clears the second stage.
When you take a regulator out, if you point it mouthpiece up, it will free flow.
And you can go through about 1500 PSI per minute.
So make sure any time a regulator is out, you point it mouthpiece down.
Remember: the most important rule of scuba diving is never hold your breath.