Hydro Atlantic without Helium?

[RyanT]

I'd dive mix if given the opportunity, but wouldn't necessarily be against diving it on air if given the opportunity to do a series of shakedown dives to get used to it again and helium being unavailable.

Just out of curiosity, when would helium not be available?

 

[PfcAJ]

Agreed, but anomalies can happen...

For example, when I did my Deep cert, part of the class was a timed task designed to illustrate narcosis. The instructor had a children's toy--a plastic globe with various shapes cut out of the sides and a set of matching plastic blocks to insert through the cutouts--and timed me first on the surface and then at 100'.

Doing the test topside primed me for the underwater test, but even so, my underwater time-to-completion absolutely spanked my topside time.

Conclusion? I AM IMMUNE TO NARCOSIS. YARRRGH.

So... you practiced and got better at something?

Cool. Very unique.

 

[Caveeagle]

Luckily life has given me options to avoid this dilemma.... costs me $10 worth of helium these days. I dive 10/65 on almost every dive now....because why not on a rebreather.

I hope nobody reading this gets the idea that diving a hypoxic mix like 10/65 is safe for open circuit at recreational depths.

I love the free exchange of information, but there seems to be no shortage of finalists for the Darwin Award!

 

[BlueTrin]

Agreed, but anomalies can happen...

For example, when I did my Deep cert, part of the class was a timed task designed to illustrate narcosis. The instructor had a children's toy--a plastic globe with various shapes cut out of the sides and a set of matching plastic blocks to insert through the cutouts--and timed me first on the surface and then at 100'.

Doing the test topside primed me for the underwater test, but even so, my underwater time-to-completion absolutely spanked my topside time.

Conclusion? I AM IMMUNE TO NARCOSIS. YARRRGH.

Did you do it at the surface before to do it underwater ?

One would expect to be significantly faster the second time, you do a puzzle.

 

[Mike1967]

Did you do it at the surface before to do it underwater ?

One would expect to be significantly faster the second time, you do a puzzle.

I'm pretty sure he's talking about one of these

I doubt one go on the surface would help you the second time lol

 

[Billy Northrup]

You can get away with advanced wreck diving on air until you don't. Something simple can easily cascade into a disaster. I don't believe solving a childs toy at depth effectively demonstrates the level of clarity needed to solve problems inside the wreck.

 

[Pavao]

If someone walks into a shop asking for 22%-23% they should be charged for Trimix prices

22%... REALLY???

 

[scubajoe123]

If someone walks into a shop asking for 22%-23% they should be charged for Trimix prices

22%... REALLY???

Just give em air and remind them that fills are accurate to within 1%

 

[tomfcrist]

I hope nobody reading this gets the idea that diving a hypoxic mix like 10/65 is safe for open circuit at recreational depths.

I love the free exchange of information, but there seems to be no shortage of finalists for the Darwin Award!

Hopefully they can comprehend what they read. OC that would not be the best plan.

I bank 10/65 at the house...so it’s easiest to fill the same mix every time...and doesn’t cost hardly anything. Rebreather mind you.

 

[Superlyte27]

So long ago and far away the NEDU was working on tests to see if you could build a tolerance to narcosis. They did similar tests to the one described above with the toy. What they eventually would discover is that while subjects could overcome a simple task with practice, when you added multiple simple tasks, subjects would fail every single time. It the snowball effect we talk about in cave training.

So, PADI Instructors used to teach signing your name at the surface and at 100’. Or tying a bowline at the surface and then at 100’. And with practice, you can get quite good at this one skill. But, you’re still impaired. And if you had multiple things going on at once, you’d see that your management of those things is grossly compromised. So, 160’ on air and you get tangled in a line and accidentally drop your knife (this happened to me) and suddenly its not as simple as putting the square block in the square hole of a 2 year old’s toy.