How Deep is Too Deep for You?

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amascuba:
I'm not a fan of deep air, but I don't currently have training with helium based mixes. There are two locations that I will dive within the next few years that are deep, but only supply air for back gas and 50%-O2 for decompression. For these dives I will dive to 150-180 fsw.

Have you done any training dives at that depth? Just curious how you felt and the degree of narcosis experienced.
 
TheRedHead:
No wah, wah, wah dives? :D

There is nothing that has captivated me to the point of hauling around that much gear.

hmmm, just a thought... but isn't this a DM job? :D
 
With just an AL80? 140', in perfect conditions only, and I'm not staying long at all.

Went to ORISKANY flight deck (137') that way last Sunday. It was a "touch the deck", then promptly get back up to about 85', where the interesting stuff is.
 
Hmm well in cold dark water (i.e. what I've been diving in) just shy of 110' has been good enough to get fairly narc'd.

I'm actually in the process of re-configuring a bit (i.e. adding a 40 cf stage as redundancy) and until I've got that I'm staying above 100. Then again, my most fun dives have taken place in < 80 fsw and I don't really see a reason to go all that deep all that often.... to each their own I guess.
 
TheRedHead:
Have you done any training dives at that depth? Just curious how you felt and the degree of narcosis experienced.

I still have two training dives left that will be at this depth. Those should be finished within the next couple of weeks. It will be interesting to see how much more impaired I am at those depths. I know that at 100 feet on air and even somewhat on 32% I have some impairment if I'm task loaded. For example: I was doing a dive this last weekend, which involved taking some measurments of a dive site using a reel with marks every 10 feet on the reel. When the dive was completed I went to untie the reel and it took me about a minute to figure out why my real wouldn't fit through the tiny loop at the end of my tie. I actually had to stop what I was doing and shut my eyes for a couple seconds and was able to figure it out quiet quickly. I contribute my rational of the problem solving to being mildy narced. The dive profile was me hugging the bottom at 86 ft for 25 minutes and making a slow 10 minute ascent using 32%.
 
I felt ok at 120 but then I wasn't trying to solve calculus problems either. I was only there for a couple of minutes. I have gone to 90 with no issues.

Mike
 
Right now with my scuba equipment and setup I feel comfortable doing 180 on air with a nitrox deco. If the wreck was at 200 I think I could be persuaded to go there. Surface supplied mixed gas I wouldn't have a problem doing 300 or beyond...:D...:D...:D
 
What is this "wah wah wah" referring to? Unfamiliar term.

I've felt narced at least a couple of times on EAN32 at 90 feet. I've had other occasions with air at 140 feet and been fine. Narcosis effects are highly variable to the state of your body chemistry that particular day.

Here's a funky story for ya:

YMCA Master Diver training in a chilly low-viz quarry. Goal was to simulate a deco dive. We went deep but really only 100 feet or so. Then simulate the deco stops for much deeper on the way back up. We were using a styrofoam surface float-flag and a line&reel as our down-line. Got down to depth, just hanging there for a few minutes. I look up and see something coming down at us! Wow, cool! As it gets closer I realize it looks kinda like our float but it can't be right because the stripe is INK-BLACK not red. I could have grabbed it as it went by but still thinking not our flag. It just keeps going down past us. Finally dawns on my narced brain as the line spins down that hey that was our flag it's the depth effect draining out colors. Yeah those are the moments that you get the external cue that you are a bit impaired, that maybe you wouldn't get on some other dive without something "outside the norm" that requires you to think. Of course what happened was our line was a bit too short so when we pulled it underwater (very small float ball) it compressed the foam and lost bouyancy.

Limit? On a single tank/reg maybe 130 feet in good conditions. With some extra stuff I'd probably go 160 feet without too many worries.
 
Orlando Eric:
To me my diving is for fun. Everything in my life is so damn serious all the time, I keep my diving fun.

When i have to break out a calculator and plan my dive for fourty minutes the nght before it is no longer fun for me.

I know there are people who adore using gas tables and deco end dive etc. I am not one of those cats.

I keep a bottle of 36~40 and a bottle of 29~32. That usually will get me through most cattle charters with five minutes of cyphering the night before, so far I think 137 is the max with MUCH MUCH MUCH more time at 13.5' (beach dives) than at 135 feet.


Yep, different strokes for different strokes, err, I mean folks. Me? I love sitting around and planning theoretical dives and doing all the calcs to see what my best mix should be, and how many CF of gas I need to complete the dive with solo and buddy rock-bottom numbers.

Personally, I feel that 120 is my limit right now. I haven't ever been that deep, so thats probably why it seems like a limiting depth for me.

FD
 

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