OP
walkonmars
Contributor
I'm not sure what information you are asking for.
I am one of a group that does not dive below 100 feet without helium. I use 25/25 for dives in the 100 to 130 range. I am way more clearheaded that way, and don't have the feeling of impending doom that often hits me around 100 feet on Nitrox, in our dark waters.
Helium's effect on decompression is controversial. Some schools believe that, because it is a fast diffusing gas, you need longer decompressions with it. Others believe that, because it is so poorly soluble, using the same schedules as Nitrox may even be more conservative than you need to be. I think everyone agrees that helium will come out of solution into bubbles easily if ascents are not controlled, so it is a unforgiving gas if you can't slow your ascent in the shallows.
I don't know of any "literature" on the use of helium in deeper recreational depths. I just know a lot of people who do it.
Thanks, for your patience.
You are answering some of my questions. I'm just trying to find out what advantages sport divers have in using trimix in the depths shallower than 130.
Do you get improved situational awareness even at 70-90ft? Is there research showing less physiological stress?
I'm told it is prohibitively expensive but if money is no object, is it better to use it (instead of nitrox) at sportdiver depths? (Assuming all safety procedures are followed)
Let's say you own a dive shop and can get unlimited trimix (and nitrox) any ratio you want for free. Would you use it to dive at 70 feet?
You are describing increase anxiety at 100. Do you feel any different at 70ft on trimix compared to air?
It is starting to sound like it isn't worth using trimix at shallow depths even if it was the same price as air.
Thanks,
T