Some really basic questions but I'd like to understand the "science" behind the answers. Knowing why I need to do something is important...
1) I understand that if you were hold to breath ascending it could lead to lung over expansion, air embolism etc. BUT if I am taking a photo underwater at say 12m and want to hold my position as steady as possible at that exact depth -- what is wrong with holding my breath for 10-15 seconds as long as I can guarantee I don't move?
2) When ascending I understand that you should not hold your breath, as above. It also makes sense to me that for the same reasons you shouldn't inhale if you ascend rapidly. If I am ascending very slowly though I need to inhale (otherwise I run out of air!) - so my question is should I be just inhaling a little bit and then very slowly exhale, or can I breath as normal as long as my ascent is slow. How slow is slow enough to be able to take a normal breath without risking over expansion?
Thanks!!
1) I understand that if you were hold to breath ascending it could lead to lung over expansion, air embolism etc. BUT if I am taking a photo underwater at say 12m and want to hold my position as steady as possible at that exact depth -- what is wrong with holding my breath for 10-15 seconds as long as I can guarantee I don't move?
2) When ascending I understand that you should not hold your breath, as above. It also makes sense to me that for the same reasons you shouldn't inhale if you ascend rapidly. If I am ascending very slowly though I need to inhale (otherwise I run out of air!) - so my question is should I be just inhaling a little bit and then very slowly exhale, or can I breath as normal as long as my ascent is slow. How slow is slow enough to be able to take a normal breath without risking over expansion?
Thanks!!