How bout a decompression theory thread? (OC deco gases with helium)

[Inspirationdiver]

While I haven't been diving OC trimix in several years, I can say that I don't switch off helium when ascending on CCR.  There are a couple reasons I believe this is a good practice.  Keeping helium in your mix is important in avoiding inner ear DCS (aka isobaric counter diffusion).  While not immediately life threatening itself, it can cause dizziness, vertigo, even vomiting (not good while on deco!).  The other reason is that it's becoming more evident that helium offgases faster than earlier models initially predicted.  I feel much better (more awake) after a dive where I use helium all the way to the surface than on past dives utilizing more N2 in my mixes.  The downside of this is that many of the deco models still in use today heavily penalize you for not getting off the helium. : (good thing the Explorer is not one of them!!)  Finally, for CCR anyways, it's actually cheaper for me to stay on my helium mix than it would be to switch to another gas on ascent.  ;D