To Akimo
You followed The PFI...
It's written "« Learn to freedive down to a maximum depth of 40m/132 feet! »
No, I hit 30M/100' "touch and go" and 20M/66' for >30 seconds. My objective was for spearfishing and abalone diving so I was after more time rather than greater depth. As I recall, you have to reach 20M/66' touch and go to pass the intermediate course. The deepest I reached on a freedive before the course was a little over 40'/12M touch and go... like about a week before starting the course.
One guy in my class said that he wanted to experience (a hypoxic) blackout, which he did. Talk about wanting to learn your limits! Of course hypoxic blackout isn't like a lightswitch -- to the outside observer anyway. The dangerous part is a shallow water blackout which is more sudden and perceptually much sneakier.