Warning deep "bounce" dives warning

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I have become convinced that the general intent of OP's posts here on SB rarely maintained beyond a few pages.
Was this topic intended for advanced divers?.......NO!
Was it a result of more than one incident? ........YES!
What was the point? Make new divers and those considering diving to NOT DO IT!
Should there be a Forum? Why not thee are many different Forums.
Does some of the bickering burn SB members out? HXXL YEAH!
Do we learn from the discussion? Yes we do!

This thread was never intended for Technical divers nor would I have simplified or kept it in this forum!
My goal was not to start a Technical conversation outside the T2T or other Tech Forums.
So I guess that I am sorry to the Technical divers trolling the New Divers Forum for offending you.
I am sorry for the New Divers who are burnt out and will not post because of being thrashed.
I guess I am sorry I even started this thread!
You want to know why SB is the way it is then take a closer look!

CamG Keep Diving....Keep Training....Keep Learning!

Have fun with this one fellows!:mooner:
  • Scubaboard should not have a forum for people who think it is just fine to hold your breath while ascending.
  • Scubaboard should not have a forum that would encourage new divers to see how narced they can get prior to losing bodily control
  • Scubaboard should not have a forum that would encourage new divers to experience a significant DCS event, for the "better understanding" this event may provide them with later.
  • scuba board should not have a forum for people who want to cave dive without any instruction--for those who want to "just do it"....
  • Scubaboard should NOT have a forum for BOUNCE DIVING.
 
Greetings to all divers new, old , or not yet certified.
In recent days there have been some accidents that were a result of dives that have been described as bounce dives.
What are bounce dives?
Well they are dives that are short in duration, Bottom Time but are deep done on single tanks.
What is deep? Well anything that is over 60', past recreational limits, or simply beyond the personal divers training and or gas planning requirements.

At this point some of you will shudder at the mention of gas planning but a single tank does require planning and is taught in OW!
I understand that when you gain more experience your gas consumption goes down but there still is a limit to the available gas.
Whatever gas plan you commit to:
a. return with 500-700psi
b. rule of thirds
c. no plan at all
there are factors that will directly impact your gas consumption.

Conditions; Currents, waves, surface swims,etc.
Personal Physical issues; fitness, hydration,etc.
Personal Mental issues; proper training, anxiety, narcosis,etc.
I am making this very abbreviated forgive me for leaving so many out.

Diving Planning takes your planned dive and these criteria into consideration while tempering it with conservatism to form a safe detailed dive plan that includes emergency procedures for the what ifs.

A BOUNCE DIVE DOES NOT ACCOUNT FOR WHAT IFS!
I am assuming that a true BOUNCE dive is done on a single tank!
I have read of several in the last month and will not mention any particular accident nor wish to demean any diver, agency, LDS that is not my purpose!
My purpose is simple, BOUNCE DIVES ARE NOT SAFE!

If you choose to do this type of dive then be very aware of what DCS is and how it kills those who violate the limits.
It is tragic to loose members of our diving community to these dives.
Please consider your family both immediate and your dive family.
WE ALL WILL MISS YOU!
I have not witnessed a DCS incident but what I have researched and been TOLD it is horrible to experience.
Please consider these warnings and dive within your limits and training.
I am not trying to push anyone around but THINK before you dive!
Make good choices, LIVE TO DIVE ANOTHER DAY!

CamG Keep Diving....Keep Training....Keep Learning!

I was taught that a bounce dive was any dive to any depth with any tank(s) that is less than 5 minutes. Time being the defining factor. You make it sound very complicated.

I guess this is today's definition: "A dive performed rapidly with an extremely short bottom time in order to keep decompression time to a minimum."

That does follow the 5 min def. at least to 200fsw.
 
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  • Scubaboard should not have a forum for people who think it is just fine to hold your breath while ascending.
  • Scubaboard should not have a forum that would encourage new divers to see how narced they can get prior to losing bodily control
  • Scubaboard should not have a forum that would encourage new divers to experience a significant DCS event, for the "better understanding" this event may provide them with later.
  • scuba board should not have a forum for people who want to cave dive without any instruction--for those who want to "just do it"....
  • Scubaboard should NOT have a forum for BOUNCE DIVING.

WHAT???

Are you trying to take all the fun and excitement out of diving? How boring is it to just "plan your dive and dive your plan" :rofl3:



If any of you readers think that this post is serious - you are an idiot. It is called satire.
 
Gas management is indeed very important in any form of diving. But how to introduce it to absolute beginner is a big challenge. Asking someone who is pretty poor in buoyancy control as well as propulsion technique to come up with a meaningful SAC is not easy.

I don't see why one has to know one's exact SAC in order to learn gas planning. Also, I don't see where one's buoyancy being a bit rough precludes learning about gas planning.

For starters, averages can be used. The concept can be taught. Thought and calculation take place before the dive, so buoyancy is not a factor. One can start by planning for an "average beginner" SAC, and at least the concepts are being learned and used.

I just think it's amazing that "Plan the dive; dive the plan" is taught, yet "make a gas plan" seems to be missing, in large part*. To use an imperfect analogy, would I teach someone to drive, send them on a long trip across Death Valley (no services), and just tell them to keep a close eye on the gas gauge? No, I would explain about how to get the size of the gas tank, the average gas mileage for the car, and the distance involved, and make some calculations -- so that the student could see in advance whether starting across the desert was even a good idea. So that the student would have some idea - in advance - how far it was possible to drive on that tank.

Too, I think it's human nature to be more "invested" in a subject when you understand it better and have more control over it. I'm sure this would not be true for every single diver, but I believe that for many, having planned gas before a dive, and knowing better how that works, they would take more "ownership" over the dive and the SPG. It's more active and positive to have planned it; and less passively just "watching for it to run out."

To put it another way, I think people might be less inclined to get distracted and forget about their air if they had planned it and were thinking "Okay, we're here, I'm expecting to have used about 1/3 of my air now," then looking down and either confirming it or seeing how it differed from their expectation.

In the incident at Casino recently, might it have gone differently if the two new divers had sat down ahead of time to plan their dive and gas? Would it have been more "obvious" how much time they had "in the tank" and how going deeper would cut that considerably shorter? Would the dive have gone differently if they were mentally "confirming" how the air supply was going down according to plan vs. simply "passively" watching the SPG? There is no way to know that for sure, but it's hard for me to imagine that it might not have helped.

I realize that you will probably not agree with me, Centrals, but I still wanted to elaborate on why I feel the way I do.

Blue Sparkle

*In thinking about it, I think somewhere along the line "1/3 out, 1/3 back, 1/3 reserve" was mentioned. I can't remember if it was in the actual class or on an early boat dive, but let's say it was in the class. I still would have liked to learn how to calculate and plan gas in advance of the dive, exactly for some of the reasons you mention: Things are a bit chaotic and ungraceful on early dives and how nice it would be to plan the gas before even getting in the water vs. just waiting to see what happens.
 
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Gas planning for beginning divers can be really simple. Discuss the idea of maintaining a safety reserve. Give them a "cheat sheet" for the values for commonly used tanks in the area, for a 60 foot depth (since they're supposed to stay there) and maybe point out how much more it is for deeper dives. Discuss the concepts of all available, halves and thirds, and point out that new divers shouldn't be in any position where thirds are necessary. That's it! And we've had a lot of OW students ask the questions that lead to this information, and nobody seems overwhelmed to get it.

Actually calculating SAC rate and predicting possible bottom time and stuff like that can wait. OW divers do, I think, benefit from the idea that gas planning is possible, and some simple ideas on how to do it.
 
I am a little confused. Up until now I have heard bounce dives described as descending to depth, ascending, and then descending again without a surface interval. Like seeing some sting ray at the bottom, coming up to much shallower depths and then going back to look at a reef. Which I understand the reason that is dangerous. Did I misunderstand?

I tend to enjoy the rule of thirds and so fat that has gotten me back to the boat with around 700 psi, which is ok. Leaves extra in case something went wrong on the way.
 
I am a little confused. Up until now I have heard bounce dives described as descending to depth, ascending, and then descending again without a surface interval. Like seeing some sting ray at the bottom, coming up to much shallower depths and then going back to look at a reef. Which I understand the reason that is dangerous. Did I misunderstand?

I would call that a dive with a "sawtooth" profile. A bounce dive is well defined by the quote below, IMHO.

Bounce dives are most often seen in recreational diving when the DM sets the anchor at a deep site and when the DM goes down after the dive to retrieve gear dropped while climbing the ladder. I have "film" pictures of a "fish collector" being picked up by a Coast Guard helicopter basket, after making five ~100' "working dives" in just a few hours. Here in Hawaii, Black Coral is a 30 Million dollar annual "industry", it is illegal to "harvest" Black Coral shallower than 180' (IIRC) and Helium is stupid expensive. :idk:

I was taught that a bounce dive was any dive to any depth with any tank(s) that is less than 5 minutes. Time being the defining factor. You make it sound very complicated.

I guess this is today's definition: "A dive performed rapidly with an extremely short bottom time in order to keep decompression time to a minimum."

That does follow the 5 min def. at least to 200fsw.
 
I have become convinced that the general intent of OP's posts here on SB rarely maintained beyond a few pages.
LOL. I must certainly agree. Nonetheless, the meanderings of the discussion are interesting.
So I guess that I am sorry to the Technical divers trolling the New Divers Forum for offending you. I am sorry for the New Divers who are burnt out and will not post because of being thrashed. I guess I am sorry I even started this thread! You want to know why SB is the way it is then take a closer look! Have fun with this one fellows!
I suspect CamG is feeling a little frustrated both by a few entirely tangential additions to his original point, and a level of didactic qubbling with his words. But, it is an internet forum after all, and I guess that is to be expected (and probably adds to the interest and value, and enjoyment). I hope he will continue to post, and I think this thread has stimulated some worthwhile discussion.

OK, so instead of starting his post off with the phrase, ‘In recent days’, maybe he could have said ‘Over the years’, or even, ‘Since the beginning of time’, although the time interval per se wasn’t the primary point of the post. So-called bounce dives – more specifically the consequences of particular bounce dives, have been the subject of at least a few SB discussions. Following CamG’s posts over the years, I have come to view him as thoughtful, sincere, and genuinely interested in helping divers – new and experienced – continue their development, their learning, their training. So, even if I were to disagree with him on some particular point with regard to bounce dives, I have nothing but the highest regard for his motivation. In the case of his here post, I interpret it as similar to several existing ‘Sticky’ notes on SB, e.g. ‘Tech diving equipment and awareness, and too much too soon’, and ‘A letter to the open water dive community from the NACD’. The common theme in those posts and CamG’s – there are some (particulary, possibly unnecessarily) risky behaviors about which divers should be made aware, and even cautioned, until they have the proper training, experience and equipment. Someone posted it the other day – mindset, skillset, toolset.

What the thread has prompted me to think about is that people (myself most definitely included) engage in risky behaviors for a variety of reasons.

Some people want to see what they can get away with; some people want an adrenaline rush, or bragging rights, or whatever; some people feel their contribution to society has gone unrecognized for too long and seek public acclaim and recognition through awards (Darwin Awards). And, yes, some people are motivated by being told NOT to do something, so they DO it just to see what all the hub-bub is about.

But, some people are genuinely curious, about what is over the next hill, what it is like to dive to 200 feet, what is it like to walk on the moon; some people legitimately want to test themselves under stressful conditions; some people want to gain first-hand experience so that they have better insight and decision-making skills. And, taking risk is a necessary part of human progress. If the Wright brothers (or their French counterpart) had listened to nay-sayers about the dangers of flight, they might not have ever attempted it.

There is a continuum between a ‘completely foolhardy, reckless and just plain stupid’ action on the left and a ‘carefully planned, extensively researched, thoroughly thought through, obsessively prepared for’ action on the right. There is danger and uncertainty at all points on the continuum, probably more on the left side and less on the right. But, everyone has to draw a line somewhere on that continuum which defines with what they are individually comfortable. Discussions like this thread may help some people draw their line in a more informed manner. In some cases society and government seem more than happy to draw the line for us, through regulation and legislation. In some cases various members of society seem most anxious to arbitrarily apply their line to everyone else.

The reality is, people are going to take risks. I think Cam’s point is, don’t take foolhardy risks by doing something that probably has limited reward but also has excessive risk, at least before thinking about it and trying to determine what those risks are. Maybe he is more conservative than some SB’ers. And, maybe he is less risk-averse than others. But, I applaud him for raising the point for discussion.
 
Well not sure true bounce dive, yet your talking a single cylinder bounce, and you are correct maintain you safe ascent with an amount of gas supply to allow for deco, and 500 or more psi when surfacing.
This is a forum for newly certified or not yet certified divers. Maintaining an amount of gas supply to allow for deco is well beyond anything that should be discussed in this forum.

New divers shouldn't be going deep enough to be able to go into deco ... bouncing or otherwise.

... Bob (Grateful Diver)
 
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