helen-louise's journal

If she had helium in her blood then she must have been using tri-mix or another technical mixture. Tech diving has become a lot more mainstream in recent years but it's still somewhat non-kosher stuff as far as the big diving organisations go. Some groups are trying to standardise it with tech diving courses, but it remains that bit more risky than regular air or enriched air diving. There is also the disadvantage that most diving computers cannot automatically calculate bottom times and ascent rates for technical gas mixtures, so you often need to work it all out before diving and anything less than an expert instructor is adding considerably to the risk.

I'm sure you really wanted to know that. ;) I really want to know who the dive company is, although it's unlikely I'll be diving in Malta.