OKay, So i went to the rapids a few months back, and me and my friends always play the "hold your breathe" challenge. SO as always we get our deep inhales and about to dive, I jokingly, placed up a chakra hand-sign underwater for laughs when they see me but after ii closed my eyes, i cant remember exactly but i repeating something in my head over and over again(something about oxygen). Then after while, I suddenly get yanked up by my friend, he was yelling was I okay and I was like, "yea, why did you pull me up?'. He told me that I was down for about 2 minutes! which is amazing to my normal 40 secs. And the most shocking thing to me was when i went up for air I wasnt deeply gasping for air or anything, one good sigh and I felt normal. However after that day, I could not duplicate wtf i did. IT was truly an weird experience. Explanation?