[Alun]

here's another interesting experiment for you...
next time get into the pool as normal without a wetsuit and perhaps you'll find that you shiver almost straight away(?). i do anyway! then just exhale passively and let yourself sink to the bottom (doesn't need to be deep). you should find that your shivering miraculously stops instantly! this is something i discovered during Seb Murat's clinic in Sweden. in all my years of freediving i had never experienced that before and it came as a real surprise!