How deep can u go?

[voop]

Good point - got to consider the pp02 as well as the % to sustain life. I'm sure more of this will be learned from trimix certification. (Which I have not done yet).

--Matt

Nope, not the % O2....only the ppO2 is of importance.

 

[MSilvia]

The %O2 or FO2 doesn't matter at all. All that matters is the PPO2.

Good point, my mistake.

 

[Green_Manelishi]

Hyper oxygenated flouro carbons may change this. Basically you end up breathing a liquid and therefore eliminate many of the problems associated with gasses.

So a liquid is less dense, and therefore easier to respirate, than a highly compressed gas? I think I read somewhere that the hyper-o2-flouros failed as a viable medium because they are too much work to respirate. And let's be honest .. you will not be allowed to simply lie there and admire the scenery. You'll be expected to do something. Otherwise, use a one-atmosphere suit.

 

[Mako Mark]

In fact the latest trend in decompression is to ride helium mixes all the way up to the switch to pure O2.

More info and links please Mike.

,

I read somewhere that the hyper-o2-flouros failed as a viable medium because they are too much work to respirate.
.

I just remember hearing about it in the late 80s and early 90s and hadnt really thought about it since then (except for when it was popularised by the movie the "Abyss"). OTOH, we breathe a liquid for months during our gestation when our lungs are too weak to breathe gas, it seems incongruent I know, but it is interesting.

Otherwise, use a one-atmosphere suit.

This is probably the way to go. I know Draeger was working extesively on this and made breakthroughs with the oil filled 3 way joints on the legs and arms. Before that they had mobility problems wheich had made the "newt suit" cumbersome and impractical.

.

 

[IndigoBlue]

How deep can I go? Well not deep enough according to my last girlfriend! :cussing: no, seriously, I'm crying on the inside...

Back in the days when Dee was monitoring posts, comments like this would have normally gotten you a warning, at least.

I suppose the reason is because although puns are funny in the mens locker room, they are not as funny in public.

 

[IndigoBlue]

...Actually, from what I understand the true "closed" circuit rebreathers (like what the US Navy uses) aren't rated to go deep at all... for the deeper dives and better bottom time you need the "partially" closed rebreathers (20% expelled per cycle) and I think tri-mix with helium helps with depth, too (but that adds to the DCS risks). Am I wrong? I'm not formally trained, just read magazines a lot. 1,000 ft? 2,000 ft? How many atmospheres is that? Gawd, the pressure's gotta be crazy... I don't know, I don't think I presonally would...

I believe the best way to draw the line is whether you are diving professionally or recreationally.

NOAA has professional protocols, and their limit on open circuit is at about 450 ft. That of course is a trimix dive with substantial decompression. Beyond that depth, for a pro, you would be on a CCR or surface supplied, and once again with trimix and deco.

As such, the "world record" attempts are clearly "unprofessional." That kind of gimmicry is taking a huge reckless risk with one's life.

For nonprofessional diving, after several years of training, you could justify safe open circuit diving to about 350 ft. Those are also trimix dives, with substantial decompression.

Once you have obtained all the training that is necessary for the type of diving (professional or recreational) that you do, depth simply becomes an issue of gas selection, decompression planning, and time limits.

So it would be more relevant to ask, What kind of training is available? And that is a good question. Rather than to ask, How deep can you go? Because your depth will always depend on (1) your training, (2) the conditions surrounding the dive, (2) the purpose, and (3) the resources available to you.

 

[cdennyb]

To answer in short - you can go clear to the bottom! Coming back and living with normal health is another issue.

--Matt

LMAO, ROTF! :11:

 

[MikeFerrara]

More info and links please Mike.

Check out some of the stuff by Bruce Wienkie (sp?) Some of which he's posted on this board.

The WKPP is another group that's gone to doing deco on helium mixes.

Lots of other divers are following suit and reporting that they feel better.

The idea is to keep the FN2 constant or declining as FO2 is increased.

I've used some helium in decompression gasses but not enough to say that it's done much for me. I also don't have a booster so that makes it hard.

 

[GrierHPharmD]

For an interesting layperson-level discussion of health issues and deep divers, I'd suggest reading The Last Dive, by Bernie Chowdury. The last chapter is sort of a "where are they now" thing, and I found it pretty sobering, reading it as a newly-certified diver.

DAN has some interesting articles on HPNS and some of the other health problems that plague deep divers.

 

[oleras]

More info and links please Mike.

,



I just remember hearing about it in the late 80s and early 90s and hadnt really thought about it since then (except for when it was popularised by the movie the "Abyss"). OTOH, we breathe a liquid for months during our gestation when our lungs are too weak to breathe gas, it seems incongruent I know, but it is interesting.



This is probably the way to go. I know Draeger was working extesively on this and made breakthroughs with the oil filled 3 way joints on the legs and arms. Before that they had mobility problems wheich had made the "newt suit" cumbersome and impractical.

.

OTOH, we breathe a liquid for months during our gestation when our lungs are too weak to breathe gas, it seems incongruent I know, but it is interesting.

I aint no doc....but i was under the impression we, as babies in the womb recieved oxygenated blood from our mothers through our umbilical cords...no lungs required ? hence the "slap on the ass"...lol

oleras