Tigerman
Contributor
Think the spare air is exatly what youd need. The big one (model 300) would last for a whole minute at 60m/200ft if youre sac is less than .43 cuft/min - which of course youre the biggest noob diver around if it isnt...
200' on air for 5 min bottom time?
- Thread starter CoopAir
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To the OP, why?
This is a zero sum dive.. I ran a couple of profiles and its pretty much asking for it.
Zero contingency, zero gain, zero for your buddy, zero zero zero.
If you want to go to 200 there are ways and it takes a bit of training, but it can be done and often is.
If this is bragging rites, it's better do do that living, and on your feet.
This is a zero sum dive.. I ran a couple of profiles and its pretty much asking for it.
Zero contingency, zero gain, zero for your buddy, zero zero zero.
If you want to go to 200 there are ways and it takes a bit of training, but it can be done and often is.
If this is bragging rites, it's better do do that living, and on your feet.
ScubaInChicago
Contributor
Why do you need to be such a debbie downer?? There is plenty to learn from this experience (If you haven't guessed, I perfer to learn from other peoples mistakes).
---------- Post added May 26th, 2013 at 10:43 PM ----------
That's almost enough to do deco on at a rapid ascent to 20'.
In any deep dive, there are factors that must be considered. Gas consumption is certainly one of them. If properly planned, this shouldn't be an issue (whether the required supply of air is provided by umbilical, or numerous cylinders in planned locations). Whether it's a decompression dive or not; you plan accordingly. The next factor is heat loss, so consideration must be made for the dive duration and conditions present. Finally, gas hazard. Since we are breathing air (unless their is a CO concern), the main consideration at depth is narcosis. This is a result of the breathing mixture and not how the breathing mixture is delivered (umbilical or cylinder). Other considerations such as visibility, current, etc. must also be addressed.
Commercial Divers plan for the volume of gas required, address the decompression issues, deal with narcosis and do an environmental hazard assessment in a similar way as a technical diver (although different equipment may be used). They both are human and are subject to the same physical affects and limitations. The dive should never be undertaken with any unnecessary risk. That doesn't mean that diving to any depth is without risk, but the risk is acceptable by those participating.
The suggestion of being so narced that you don't know your name is only possible if the Diver concerned, dives outside of his safety envelope. You don't learn to dive caves or wrecks without further training and skill development. You don't dive deep air unless you take similar precautions.
What "risk" a Diver takes, is up to that Diver. You might believe that diving deep air is an unnecessary risk, while another may feel the same way about diving into a cave or wreck. I know lots of commercial divers who feel that saturation diving is insane, yet for several years I made my living this way.
Is diving deep air, cave, or wreck diving unsafe? I certainly don't think so, as long as long the Diver possesses adequate training, experience, is properly equipped and plans the dive accordingly.
Ignorance can be educated. Crazy can be medicated. But there is no cure for stupidity... Dive within your safe diving envelope. This can be expanded with training and experience. The fact that your envelope is different from another person's, should not be a source of criticism.
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Getting back to the OP and his issue....if the Op and his friends could do their 200 foot air dive on surface supplied air with a full fask mask or helmet on, I don't think I would have to much concern over the dive...the typical FAILURE to monitor air supply would be moot.....For most of the problems you hear about, that recreational divers end up with from running "personal best" deep drops, the surface supplied air and helmet would eliminate the high potential for catastrophe....but then again, without the training for this, who knows what CF they could create for themselves 
People have been jumping on the OP for contemplating doing something stupid, and he has apparently long since left the thread. I don't believe he ever said he was contemplating doing this, though. My impression was that he was asking the question for academic purposes because of a discussion gong on in another thread. I don't know for sure, but let's not leap to unwarranted conclusions.
R
redacted
Guest
We may need another forum for that.
Bob DBF
Contributor
If someone is asking the question for academic purposes, I suggest that they just start doing research rather than asking a question on a discussion board. I found an answer in the Navy Dive Manual in five minutes or so, and with more time I could research other sources, if needed. I've spent much more time reading this thread which have a myriad of conflicting answers and opinions, not to mention advice on how one should dive. It is that way in nearly every thread anywhere, for facts I'll do my own research, and for opinions I'll post. There is a need for both but one should not confuse the two.
Bob
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BDSC
Contributor
But isn't that the ScubaBoard way?
He didn't say he was going to use a single AL80 either, but that didn't stop anyone assuming
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