[naiad]

I may give that a try, but not sure about how safe it is. As I still freedive, I want to be sure that I will not breathe in with my face in the water for any reason, even blacked out. So far it has worked that way.

It is a difficult one - I am realising that a lot of the training for scuba and freediving is contradictory, such as not holding your breath and ascent rates. If I do both, I will only do scuba to a depth of a few metres. It is just too scary not to be able to do a rapid ascent if things go wrong.