Normoxic Trimix in Mod 1???

Dsix36

This is basically how it works for me with my IANTD training. I am still in the training part of it and don't have a helium card yet though. My LDS is also my training facility and I have no problem getting fills locally.

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Abbo

I've brought up this subject on Rebreather World before. I said a highly respected instructor here in Japan encourages all his CCR students to put Helium in their dil right from Mod 1. I think he's absolutely right. I was told "he'll have serious trouble from the insurance companies if there's an accident". Insurance companies know nothing about diving: they merely insist that divers have the appropriate qualifications. The qualifying agencies should therefore be encouraged to have a rethink, because it makes a lot of sense to use Helium right from Mod 1. You are forbidden, under the law, to Drive Under the Influence; why are insurance companies forcing people to Dive Under the Influence?

Mod 1, 2 & 3 limits should be about how much deco you are allowed and how deep you go, not about what gas you put in your tank, just like it's about how fast you drive on the road, not what gas you put in your gasoline tank . Sure, you need to understand the implications of breathing Helium, but not to take the same course units in CC as you took in OC.

hillbilly

Heres one for ya!

I'm IANTD trained with the meg (mod 1 - 140', max deco 10 minutes) but for me to go to trimix on a Rebreather through ANDI, I need TSD (Deco Procedures, OC). A step back in time as far as I'm concerned.

I agree bouyancy control is a must, diving with trimix. But hey, reverse O2 flush at 20', you better have good bouyancy for that!

Question 1: Does the CCR trimix course cover implications diving with Helium?

Question 2: Doesn't the CCR trimix course cover if you bailout to OC on trimix anyways?

Question 3: Why go back and dive with doubles to "Get The Card" then put on the CCR again to do "CCR Trimix"? Especially if it is Deco Procedures as the prerequiste and not trimix oc.

Doesn't make sense to me!

sensor330

Do you hold any Tx cert now? If you do some instructors might give you a break on training as they don't need to spend the extra time on you.

Question 1 yes

Question 2 yes

Question 3 shouldn't have to.

Scott

ScubaDadMiami

I'm not trying to ruin the party on purpose. Really, I promise! But . . .

We all know that a Helium bends case will almost certainly involve the central nervous system compared to nitrogen. We all know that our bouyancy when we first finished up our initial training on rebreathers was nothing like it was when we dived on open circuit. We all entered into rebreathers understanding that we would need to start off making entry level dives until we were fit to go beyond these limits.

With this being said, I made sure to maintain my depth and narcotic limits within the zone where I did not need helium to stay clear in the head while I was working on my skills after my initial training. This was especially hard for me to do when I went wall diving on a liveaboard trip, but I did it even then.

It was only after I felt ready to proceed, contacted my instructor, and completed the additional training that I started back using helium in my diving again. I'll bet that I even learned a thing or two by taking that second class and progressing according to the training protocols.

Was it easy to hold back after making open circuit helium dives to 250 feet before having to go back to the "baby pool?" No, it wasn't. Did I like parting with more money to essentially re-take a trimix course after I was already trimix certified on open circuit? You know that this part probably hurt the most. However, had I rushed before I was ready, and then had a flight to the surface that resulted in the potential exposure to a major bends hit on helium, I'll bet that I would have been a lot more upset about the final outcome than I did by waiting until I fulfilled the formal requirements.

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Howard Packer
IANTD CCR Instructor
Miami Beach, Florida
CCRDiveTraining.com

Brainx3

Hi,


Well, it seems that there are positive and negative sides of using Helium before learning a bit more about it within proper courses. I, myself never used Helium because I'm still at MOD 1, but I think it would be a good idea to make an intro potion to Helium by the end of MOD 1 in order to allow divers to be able to use it within their MOD 1 limits (45 meters) instead of being narcotic when they are doing dives deeper than 30 meters, AND to allow CCR divers MOD 1 to purchase Helium from dive centers at the same time. Maybe some of you guys who can do some positive changes in the industry would actually take the step to do so?!

Question: I'm a Trimix Gas Blender, would I be able to purchase Helium from Dive Centers as an independent blender in general worldwide? In Sweden, with the right contacts I can


Best Regards. Wael

Abbo

CNS hits from Helium bends make a very compelling reason for keeping deco below 10 minutes until you have passed Mod 2 but, I would argue, not a reason for shunning the demon gas.

luckybob99

What really gets me is that TDI quote "
The prerequisite for this course is 100 hours on the unit " (MOD2)
Now they also quote that you only need this to become an instructor (100 hours) .
So I can do my MOD 2 and then my instructor and teach the course....Something not right here is there ????

wearypanda

So, I have PSAI Mod 1 on the Pelagian. TDI Decompression Procedures and Advanced Nitrox. Can anyone advise me as to what would be the best certification route for me to be able to use Trimix down to say 50-60 meters?

Mark Chase

Would it be fair to say you can do some nice 20-30m diving where you live?

Coz where i live its hard to do.

To get better viz during about six months of the year you need to go mid channel. Thats late 40-50m in the shallow bits.

Then you should be good for 4-5m viz off season can can be blessed with 10.

We have only a few glorious weeks of the year when you get better than 3-4m vis inshore.

SO the choice is, a good viz 40-50m dive with a whiff of trimix or a hand in front of you to stop from bumping into stuff dive in 25-35m on air.


If I lived in the Red Sea area id have happily done my 100 hours before going on to mix.

ATB

Mark

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