OC Gas switch protocols?

[PfcAJ]

Not sure Don Sherley is going to agree with your statement.

I dont know the story. Can you share?

 

[lermontov]

I just finished my trimix course and that's what we were taught.

Here's another couple of things I learned. First, both my deco regs have green hoses. I'm going to swap out my 50% deco reg to a different color (still retaining the green 2nd stage cover). This makes it much easier for both yourself and your buddy to ensure that you're not switching to O2 at 70'. Second, I learned to tuck the O2 bottle up behind the 50% on a separate D ring, making it harder to get to. Your 50% bottle should be in an easier, more natural location to reach. While deco'ing on 50%, you now have plenty of time to reach back and prepare your O2 bottle for your 20' stop. Doing both of these things adds safety and facilitates gas switches in a timely manner.

yes similar set up i have my high% on yellow hose and yellow reg I also have my hoses on the other 2 cylinders on different colours (black /green)and i have a dab of paint on the top of each of the reg to match the tank so all I have to do is glance down to my reg to know what hose (and tank ) im breathing from

 

[Michael Guerrero]

So, assuming OC and OW, at what depth do you start at least thinking about carrying 3 deco gases? I think 150' is about where I would be looking at carrying 2. So, where for 3?

Run your planning software and determine how long you want to be in the water.

 

[Michael Guerrero]

I dont know the story. Can you share?

Assuming this wasn't a joke, he was David Shaw's instructor/co-diver for the recovery dive of Deon Dreyer in South Africa. He took an inner ear hit on his ascent and had a challenging rest of the dive.

 

[lv2dive]

It was my understanding Shirley was actually a support diver for Shaw on the dive in question, and Shirley went to try to help Shaw when Shirley noticed Shaw was in trouble (his light had stopped moving).

At any rate, as I've pointed out twice already, dives that are deeper than 350' (Including Shaw/Shirley's dive to >200 METERS) are in a completely different category (and I strongly believe shouldn't be discussed as the same type of dive).

Assuming this wasn't a joke, he was David Shaw's instructor/co-diver for the recovery dive of Deon Dreyer in South Africa. He took an inner ear hit on his ascent and had a challenging rest of the dive.

 

[Michael Guerrero]

actually a support diver

You're right, I misspoke. I meant co-diver in that my recollection is that he was prepared to dive to the same depths if needed, but yes, his intent was to be a (super) deep support diver on a 900+ foot dive. He attempted to get down to Dave but his (Hammerhead?) electronics broke on his RB and he aborted, suffered an inner ear hit, and crawled his way for hours up the topsy-turvey line.

 

[PfcAJ]

Assuming this wasn't a joke, he was David Shaw's instructor/co-diver for the recovery dive of Deon Dreyer in South Africa. He took an inner ear hit on his ascent and had a challenging rest of the dive.

Ah, didn't know his name. Thx.

 

[ajduplessis]

I dont know the story. Can you share?

Amnesia suddenly? Dont know the story of Daviw Shaw and Don Sherley (aka Raising the Dead)

Maybe you should study ICD a bit more before commenting it is "textbook stuff that does not happen in real life" especially in a technical forum.

 

[Centrals]

If my memory is correct, late John Bennett also suffered ICD at around 60m on his 305m dive.

 

[ajduplessis]

If my memory is correct, late John Bennett also suffered ICD at around 60m on his 305m dive.

Can't be, ICD is not a real life risk according to some...

ICD is a real risk that will pose risks during trimix dives, it is not just a problem on extreme dives as those by Bennett or Sherley. Shallower trimix dives to 100m or less can pose the same problems during bad gas switches.