Why you want to interview instructors

[Etmutt]

really i must be missing something here ; but i do not get at all the irony …

the article is a bit long for what it covers but an h valve is quite good if you want to prevent gas loss issues. almost as good as a second tank. if you dive solo, you do need to think about those kind of failure mitigation plans

 

[rjack321]

really i must be missing something here ; but i do not get at all the irony …

the article is a bit long for what it covers but an h valve is quite good if you want to prevent gas loss issues. almost as good as a second tank. if you dive solo, you do need to think about those kind of failure mitigation plans

It's an awful idea. The H valve is only the start of the dumbness which permeates the color coding, the labelling, the gas choices, the runtimes, there is literally nothing here worth emulating.

2x al40s with 50% and O2 covers all of the purported issues and then some.

 

[VikingDives]

Nice list. One possibility that concerned me when I was just getting into tech diving, is that some idiot recreational diver would find and take my deco bottle that I left before penetrating a shallower wreck (e.g., Spigel Grove). Have you ever heard of that actually happening?

I stowed a deco bottle a couple of weeks ago and due to circumstances with a student, we didn't pick the bottle up before we surfaced.

When I returned an hour or so later, my gas had been turned on and several hundred psi were missing. . .

Every time I think, "No one could be that stupid" someone comes along to prove me wrong.

 

[johndiver999]

It's an awful idea. The H valve is only the start of the dumbness which permeates the color coding, the labelling, the gas choices, the runtimes, there is literally nothing here worth emulating.

2x al40s with 50% and O2 covers all of the purported issues and then some.

You forgot a shut off valve on each second stage... Critical components I think.

 

[Etmutt]

It's an awful idea. The H valve is only the start of the dumbness which permeates the color coding, the labelling, the gas choices, the runtimes, there is literally nothing here worth emulating.

2x al40s with 50% and O2 covers all of the purported issues and then some.

gas choice ok but it is not really the point of his article. same for labeling; and he does not mention color coding.what is wrong with h valve?

 

[Etmutt]

You forgot a shut off valve on each second stage... Critical components I think.

yeah ok the shut off…. this really doesn’t make sense

 

[Nick_Radov]

That's really the key question here. How does one go about "losing" a bottle of deco gas, in an open water dive. I suppose there are scenarios I haven't thought of but they seem remote.

In my Tech 1 class the instructor snuck up and stole my buddy's deco bottle. We were so busy dealing with other issues that he never even noticed until we got to the gas switch.
I did once have a deco stage reg completely fail during a dive. Had to get my buddy to help me swap it out.

 

[Nick_Radov]

What is the real world intersection of hyperoxic mixes for bottom gas in planned-deco scenarios? [yes, I can certainly see EANx for LONG shallow deco dives, but is that really a subset worth mentioning?]

We sometimes do long shallow (up to 3 hours run time) scooter dives on 32% nitrox and bring a 100% oxygen stage to clean up at the end. It isn't strictly necessary but at that point we're freezing cold and just want to get out of the water as quickly as possible.

 

[Nick_Radov]

Priceless You all should enjoy too

When Two is None - True Decompression Redundancy

There is an old adage among engineers who design safety systems for space exploration, it goes like this; 'Three is one and two is none'.

www.billnadeau.ca

This would be hilarious if he wasn't out there teaching actual students. Interviewing instructors is all well and good, but most students don't even know the right questions to ask. I was lucky that I found some good resources early in my diving career but it could have easily gone the other way.

 

[lostsheep]

What good does interviewing an instructor do if you don’t know what you don’t know?

If I don’t know what I don’t know, I sure as **** don’t know what you don’t know.

I ain’t on board with anything this dude is doing but I don’t think we’re doing much to help any newer divers reading this thread.