Chandelier Cave - safe for AOW diver?

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There's no pontification... purely an explanation of how accidents are caused by 'negotiation' of risk assessments, coupled with industry guidelines/recommendations of (1) what constitutes a cavern/cave and (2) what training is needed to dive a cavern/cave... and how those guidelines/recommendations pertain to keeping safe in the water.

I'm not advising on any particular course of action with regards the specific dive concerned - merely providing a framework for risk awareness and assessment, in line with community recommendations, so that divers might be better aware of the thought processes, considerations...and potential pitfalls.... in deciding safe and suitable limits to their diving.
 
There's no pontification... purely an explanation of how accidents are caused by 'negotiation' of risk assessments, coupled with industry guidelines/recommendations of (1) what constitutes a cavern/cave and (2) what training is needed to dive a cavern/cave... and how those guidelines/recommendations pertain to keeping safe in the water.

I'm not advising on any particular course of action with regards the specific dive concerned - merely providing a framework for risk awareness and assessment, in line with community recommendations, so that divers might be better aware of the thought processes, considerations...and potential pitfalls.... in deciding safe and suitable limits to their diving.

Pontificate: "to speak in a pompous or dogmatic manner"

I feel responsibility and professionalism just dripping off their tongues...

They list themselves as a PADI 5*IDC... and yet their website contains several statements (including the one above) that directly contradicts the recommendations and safety guidelines issued by PADI.

They offer Cavern Diver courses though... so they should be clear about the 'all levels' issues with overhead environments.
The pompous part lies with your sarcastic implication that Neco is more about profit than safety and that you clearly know better. The dogmatic part? That's pretty clear too.

Neco is clear about the 'all levels' issues. It's an overhead environment that isn't really an overhead environment, just an indoor pool with swimthroughs and stalactites. A beginner diver could experience a pseudo-cavern like Chandelier Cave and then go on to take a cavern class to dive in real caverns. There's no need to insult their responsibility and professionalism here.

---------- Post added at 09:37 AM ---------- Previous post was at 09:30 AM ----------

Here's a good description of the dive from the Fish & Fins website:

"Diving: Entrance to the cave is through a 10-foot (3 meter) diameter opening in the rock island approximately 12 feet (4 meters) from the surface. Underwater lights are a must and the brighter the better. The bottom of the cave is sand and silt that can easily be disturbed. Do your best to stay off the bottom. As you enter the cave system, the first thing you can see is darkness followed by even more darkness. If you look back toward the entrance, you will see a bluish light; this light is visible no matter where you are in the cave system. As you enter the first chamber and your eyes adapt, you will start to make out the shapes that appear to be hanging magically from the water surface. These will emerge as enormous stalactites hanging down into the water. Start your ascent slowly, with one arm raised above your head so you do not accidentally hit one of the stalactites and damage it (or your head). In the first chamber, as you shine your light above, you can see the marvelous colors and shapes that nature has provided. From here you can work your way on into the other 4 chambers. If you want to enter the 5th chamber you will have to remove your dive gear. Be forewarned, you will have to crawl and slide through some very tight places lined with slippery black mud, but the reward will be worth the trip. While still in the cave system it is fun to turn off all dive lights; you will begin to understand the real meaning of black. In a few minutes, the light from the cave entrance will become visible and soon you will see an eerie green glow.Take time to re-explore each chamber, with your eyes adjusted to the dark everything will look a little bit different."
Scuba Diving Palau with Fish 'n Fins - Dive Sites

This description acknowledges the potential for silt, but also notes that the cave entrance is visible even in the dark (assuming it's daylight outside).
 
Pontificate: "to speak in a pompous or dogmatic manner"
The pompous part lies with your sarcastic implication that Neco is more about profit than safety and that you clearly know better. The dogmatic part? That's pretty clear too.

Neco is clear about the 'all levels' issues.

What is pompous about stating a fact? The 'fact' being what a scuba agency (that Neco happens to represent) classify as cave and cavern diving... and the associated recommendations they make for dives of that nature.

It's an overhead environment that isn't really an overhead environment,

Of course....

Is that a zen saying... or are you really prepared to contradict yourself in a single sentence?

I'm doing a deco dive, but it's "not really" a deco dive.
I'm exceeding the speed limit, but it's "not really" exceeding the speed limit.
I'm drinking and diving, but it's "not really" DUI.

There's always a rationalization, isn't there?
 
What is pompous about stating a fact? The 'fact' being what a scuba agency (that Neco happens to represent) classify as cave and cavern diving... and the associated recommendations they make for dives of that nature.

Of course....

Is that a zen saying... or are you really prepared to contradict yourself in a single sentence?

I'm doing a deco dive, but it's "not really" a deco dive.
I'm exceeding the speed limit, but it's "not really" exceeding the speed limit.
I'm drinking and diving, but it's "not really" DUI.

There's always a rationalization, isn't there?

These are the classifications you posted:

Is it an overhead or not? i.e. Can the diver resort to immediate ascent to the surface at any dive during the dive, should they encounter a problem? Is it a cavern dive or not? i.e. is there risk of silting/loss of illumination leading to the diver being delayed/prevented from egressing (not surfacing) from the water when required?

In a black and white world, you may be correct. Even then, there are shades of grey.

In the case of Chandelier Cave, these aren't easy questions to answer. Yes, the diver can resort to immediate ascent to the surface at any time during the dive. The swim-throughs are very brief, nothing like the long swim-throughs commonly dove in Cozumel by beginner divers at many PADI-blessed dive ops on the island, for instance, so it's a no-brainer to simply go in either direction through the hole and make a direct ascent. When you make the ascent, you will still be in an "overhead environment" but you will be able to remove your reg and breathe fresh air. Like my analogy, it's similar to ascending in an indoor swimming pool. Yes, there is a ceiling so it's technically an overhead, but does diving in an indoor swimming pool really violate PADI OW standards? (The only difference between CC and a swimming pool is that the ceiling is a bit lower than your average indoor swimming pool and there are stalactites, hence the warning to put your hand up first - but then that's not much different than avoiding ascending under a dive boat prop).

The silt issue may arise, but one can still ascend directly to fresh air and work out any problems at the surface or wait for rescue. Waiting for rescue is entirely feasible because the water is warm and there would never be conditions that could hamper a rescue team.

So while Chandelier Cave superficially resembles a cavern, it's not a cavern. How's that for clarification?

As for your other questions, you should know that (1) all dives are deco dives, (2) highway speed limits in the U.S. at least were originally imposed as fuel-saving measures, not for safety, and (3) in California, one can drink and drive as long as one doesn't drink too much as the legal standard is 0.08% and it used to be 0.1%, both numbers being somewhat arbitrary as all individuals respond differently to the effects of alcohol on their ability to drive.

Speaking of bright lines, do you also feel it's a breach of professionalism for dive ops to take divers to 61' without them having PADI AOW "authorization"?
 
These are the classifications you posted:

You seem to be missing the point. I was providing a different perspective which addressed the OP's question. That perspective was the 'scuba industry recommendation' - both the (very clear) direction from PADI and the (very clear) direction from the cave diving community.

In addressing those perspectives, as an answer to the OP's question, I attempted to explain why those recommendations are made...and globally supported. In doing so, I also raised the issue of 'risk rationalization' - and how that deceptive process features to a degree in most scuba accidents.

In a black and white world, you may be correct. Even then, there are shades of grey.

Which is why I felt that highlighting the issue of 'risk rationalization' was important.

It's obvious that you feel Chandelier Cave is safe. You have rationalized that belief, contrary to the industry guidelines.

Now.. I'm not saying you are right or wrong. Merely that you have done some diving that is beyond the scope of your training and which contradicts the safe diving practices that you agreed to abide by when you qualified as a diver. Those are facts - unless you are a cave trained diver.

The danger, when giving advice to less experienced divers, is that those 'shades of grey' are ultimately something that have to be determined by the individual. If the individual has little experience, or training, as a diver - then they are not well prepared to make that determination. It becomes too easy for them to 'risk rationalize' themselves into a dangerous situation that is beyond their individual capability. Hence, the scuba industry/community has drawn together recommendations which make the situation black and white - and prevents the need for inexperienced divers conducting a risk assessment that they are insufficiently trained or educated to complete accurately.

You are an instructor and qualified technical diver. So am I. I am positive that both of us have a clear idea of what is safe...and what is dangerous for ourselves. That level of risk - our personal comfort zones - may not be appropriate for lesser qualified/experienced divers.

IMHO, what's important is that divers conduct their own assessment. In that sense, you are giving the OP an answer to his question, wheras I am attempting to educate the OP to determine his own answer.

In the case of Chandelier Cave, these aren't easy questions to answer

Which is why a self-determined answer, made in full knowledge of the risks, the recommendations... and the dangers of risk rationalization should be made by the individual.

Personally... I think that if the question isn't 'easy' to answer, then the answer is probably no. I see a logic and prudence to that - which fits within the parameters of safe diving practices... "always err on the side of caution". To do otherwise, is to accept the role of 'luck' in your survival.

Again... that's just a perspective... and something that I'd only advise a diver to consider, when making their own decision.

Yes, there is a ceiling so it's technically an overhead, but does diving in an indoor swimming pool really violate PADI OW standards? (The only difference between CC and a swimming pool is that the ceiling is a bit lower than your average indoor swimming pool and there are stalactites, hence the warning to put your hand up first - but then that's not much different than avoiding ascending under a dive boat prop).

Do you have to swim out of a submerged pipe to exit the swimming pool?

The point being, there are times when you are in an overhead environment (submerged) without immediate access to the surface. It doesn't matter if that is only for portions of the dive... it matters that the situation exists where a diver may be unable to surface instantly. It also matters that the diver is not able to exit the dive without submerging and swimming underwater.

OW/AOW divers receive absolutely zero training for such situations. Likewise, they receive absolutely zero training or education on issues such as silting, light failure or losing the buddy, the exit or direction.

When making a personal determination on competence to conduct the dive in a safer manner (having mitigated all foreseeable risks)... the diver should compare the skills/training they possess against the skills/training that the dive requires (in the worst case scenarios).

Again, you might note that I am not telling anyone what to do - I am merely raising an educational point that should be factored into an individual's personal decision making and risk analysis considerations.

Namely:

"Does my training enable me to mitigate all foreseeable risks, with a reasonable level of assurance?"

"Am I aware of the full spectrum of risks and therefore making a reasonably accurate risk assessment?"

"Am I aware of my own capabilities, in relation to the risks and worst case scenarios, that I may face on this dive?"

I won't advise a diver 'yes or no' to conduct any dive - whether I have personal experience of that dive or not. I will just try and educate them on how to make their own decision.


Waiting for rescue is entirely feasible because the water is warm and there would never be conditions that could hamper a rescue team.

Any diver making their own risk determination for this dive, should pay careful heed to that statement. I guess their decision will be determined by whether they are happy to place themselves into a situation where they could be trapped, alone, in the dark, floating in water, for a prolonged and unpredictable amount of time - waiting for a rescue team to receive an alert, mobilize, travel to the site, conduct a rescue dive to extract them. Also, whether they'd be happy to filmed by the TV news - wet, scared and exhausted being escorted out of the cave to the headline of "Terrified Tourist Rescued from Underwater Cave".

I'm not sure if the rescue services charge for their services in that location , same for any medical care needed - but if they did, you insurance won't pay up - because you were diving beyond your formal certification/training level...which is a typical caveat linking insurance cover and diving activities.

So while Chandelier Cave superficially resembles a cavern, it's not a cavern. How's that for clarification?

So while Chandelier Cave superficially resembles a Chicken Biriyani, it's not a VW Beetle. How's that for clarification?

If you're going to throw away the industry/community definitions, you might as well do it in a fun way... :wink:

Humor aside... do you really think your approach is the best value, and most prudent, way to advise inexperienced divers on risk assessment. Please remember - we are trying to answer the OP's question here - rather than just 'win' a theoretical debate.
 
You are an instructor and qualified technical diver. So am I. I am positive that both of us have a clear idea of what is safe...and what is dangerous for ourselves. That level of risk - our personal comfort zones - may not be appropriate for lesser qualified/experienced divers.

IMHO, what's important is that divers conduct their own assessment. In that sense, you are giving the OP an answer to his question, wheras I am attempting to educate the OP to determine his own answer.
No, you were trying to convince the OP to not do the dive, I was trying to convince the OP that you were full of hot air and that he should ignore you.

Which is why a self-determined answer, made in full knowledge of the risks, the recommendations... and the dangers of risk rationalization should be made by the individual.
But you do not have full knowledge of the risks because you've never done the dive. I have. That's a big difference in my opinion as to being able to evaluate the risks to a less-qualified diver.

Personally... I think that if the question isn't 'easy' to answer, then the answer is probably no. I see a logic and prudence to that - which fits within the parameters of safe diving practices... "always err on the side of caution". To do otherwise, is to accept the role of 'luck' in your survival.
It's only difficult to answer within the strictures of your PADI rules. If the question were simply "is it safe to do" and not "is it safe to do within the PADI rules" then the answer would be a simple and unqualified "YES!!!".

Again... that's just a perspective... and something that I'd only advise a diver to consider, when making their own decision.
How can a diver who's never done the dive and is relative new to diving be able to make the rational decision of whether the dive is too advanced for them or not? It behooves them to rely upon other divers who have done the dive to provide the advice, not rely on some theoretical applications that have nothing to do with the actual site.

Do you have to swim out of a submerged pipe to exit the swimming pool?
You may have to climb up a ladder. That's much more physically challenging than exiting Chandelier Cave.

The point being, there are times when you are in an overhead environment (submerged) without immediate access to the surface. It doesn't matter if that is only for portions of the dive... it matters that the situation exists where a diver may be unable to surface instantly. It also matters that the diver is not able to exit the dive without submerging and swimming underwater.
There are many dives when you are underwater without immediate access to the surface. You are always limited by ascent rate. If you're at 130', would you really consider an "immediate ascent"?

Fortunately, the average depth of Chandelier Cave is about 20' and total bottom dive is broken up by repeated surfacing to breathe fresh air. You have to dive to the bottom (around 60' IIRC) to be able to silt up the cave and most people don't bother. So ascents can be more immediate than on many open water dives. In that respect it's actually safer than the average open water dive.

Why does it matter so much that the diver is not able to exit the dive without submerging? Perhaps in the rare case of a heart attack mid-cave, maybe. But this would be the rarest of cases and even then, I suppose arrangements could be made that would be almost as safe as rescuing a heart attack victim from an open water scenario.

OW/AOW divers receive absolutely zero training for such situations. Likewise, they receive absolutely zero training or education on issues such as silting, light failure or losing the buddy, the exit or direction.
None of which matter when it's a group dive, the divers stay together, light failure is irrelevant because there's a visible exit path, and silting is pretty remote. Direction also is irrelevant because there's air to surface under in either direction.

When making a personal determination on competence to conduct the dive in a safer manner (having mitigated all foreseeable risks)... the diver should compare the skills/training they possess against the skills/training that the dive requires (in the worst case scenarios).
No. Worst case scenario is a tsunami. No one is trained for that.

I'm not sure if the rescue services charge for their services in that location , same for any medical care needed - but if they did, you insurance won't pay up - because you were diving beyond your formal certification/training level...which is a typical caveat linking insurance cover and diving activities.
DAN USA will certainly "pay up" if there were an accident by a covered OW diver in Chandelier Cave. Maybe your particular insurance varies, but that's a fault of your particular insurance.

Humor aside... do you really think your approach is the best value, and most prudent, way to advise inexperienced divers on risk assessment. Please remember - we are trying to answer the OP's question here - rather than just 'win' a theoretical debate.
That was humor? I know you Brits are dry, but...

Yes, I do believe my advice is far superior to yours for the inexperienced diver posing the question. I am trying to answer the OP's question from my personal experience of both the site and of divers in general. You are the one quoting theory that has no application to the site in question. Nonetheless, I believe I've won both the theoretical and the practical debate here, so whatever the prize is, I should get double.
 
I had dived the cave back in 1999 as a certified technical wreck diver. Everyone was on single tank. The maximum depth was about 16m and the whole dive lasted 33mins. I can still remember I had spent lots of those mins with my head out of the water admiring the huge air-pockets.
Is the dive dangerous? Everyone dive is potentially dangerous as far as I am concern.
Is it an over-head environment? Yes and no. There are so many air-pockets around that I cannot really describe it as "proper" overhead.
Is it suitable for any diver? Yes and no. Some divers shouldn't be under water at all.
I can't see any cave divers would go in with full monty.
What if as we technical divers like to ask? You make your decision.
 
Is it an over-head environment? Yes and no. There are so many air-pockets around that I cannot really describe it as "proper" overhead.
Thank you Centrals for repeating my ambiguous answer. Yes and no it is! See DevonDiver, I ain't the only one who's confused by applying proper PADI standards to a really weird dive site.
 
FWIW, here are a couple of videos I took last month while diving Chandelier. My intent is to show what I experienced, not to condone or promote diving this site. The first is the exit of the site. The second is entering one of the chambers.

Chandelier Cave Exit - YouTube

MVI 5006 - YouTube
 
FWIW, here are a couple of videos I took last month while diving Chandelier. My intent is to show what I experienced, not to condone or promote diving this site. The first is the exit of the site. The second is entering one of the chambers.

Chandelier Cave Exit - YouTube

MVI 5006 - YouTube
Very cool exposition of the ambiguity of Chandelier Cave. Overhead environment, to be sure. Yet you can stand up and breathe. Easy shallow dive, yes. Potential for a really bad outcome, maybe slightly. The fact that most dives in the cave are done by groups, not buddy pairs or soloists, reduces the danger in terms of likelihood of separation from redundant light/air/moral support (though perhaps increases it a bit due to increased silting risk). Overall, there is no reason to classify this dive as any riskier than a reef swim-through or light penetration of an open shallow wreck. If a 30' slack current warm clear open-water reef dive gets an A, Chandelier Cave should be a A- or B+ at worst. Compare that to a risky open-water-sanctioned dive like Blue Corner where you have to hook in against strong current, and where at least one diver according to my memory has died (I'd call it a B-/C+ on my danger scale since the current is always ripping), then the agency standards that would approve of Blue Corner and forbid Chandelier Cave must have it wrong or else there's more leeway for interpretation or ambiguity in the facts than you appreciate.
 

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