halemano:
you can only breath out through the nose when there is water around the nose.
SNorman:
Not sure what exactly you mean?
If you breath in through your nose when there is water around it, you will breath in the water!
Before any of my students breath underwater with a mask on, I require them to breath from their regulator 4 normal breaths with bare face in the water. We are standing in the pool and we lean forward putting our face in the water. If you can swim without a nose plug or mask, you can most likely do this easily. There is little point continuing if you can not do this, because the third skill once underwater is
partial flood and clear. Standards are to
Master this skill before moving on.
If you just barely contain your panic while clearing a partially flooded mask, you have not successfully completed the skill. In the PADI OW course,
Mastery is defined as
a reasonably comfortable, fluid, repeatable manner as would be expected of an Open Water Diver. If you can not
Master partial flood and clear you shouldn't go deeper than water you can stand up in, and you are not allowed by Standards to progress to Confined Water training session #2.
Confined Water session #2 includes
mask removal and replacement and
no mask breathing, although why PADI lists them in that order is very odd. You must perform both breathing for at least a minute without mask and clearing it after putting it back on, which could easily be one skill. Without
Mastering these skills, you are not allowed to progress to CF #3, and can not participate in Open Water dives 2-4.
I am not interested in taking referal students into Open Water without the Intro Confined Water training session, because I want to at least see the partial flood and clear before going into Open Water.