What can we learn from this ?

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rick00001967

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i was not sure where to post this. if there is a more appropriate forum for this pls move as you see fit. if this is a repeat posting of a known incident, i apologize. i only heard details on this recently.

i have no inside knowledge this event. i do not know anyone that was involved personally. i do not dive back mounted doubles. the information that was passed on to me sounded like the type that should to be shared and discussed. i will try to be brief.

diver enters the water wearing back mounted doubles. this diver is joining two other divers during their class. the two other divers are a student and instructor performing shallow water skills for some type of advanced training.
diver was wearing a dry suit but only had one lp hose on their rig.
at some point near the end of the training the student and instr headed for the surface while the other was to follow. unfortunately the inlet fitting on the bcd power inflator came dislodged somehow. seeing as the lp hose was attached at the time, the inlet fitting was still attached to the lp hose. this would obviously lead to a rapid loss of gas.
the belief is that due to excessive suit squeeze, (from not inflating the dry suit) the diver was not able to reach back and close the isolator valve on the manifold to stop the loss of gas.
the divers computer showed they made it briefly to the surface. it seems the diver could not establish positive buoyancy and ended up on the bottom again and eventually ran out of gas.
the result was loss of life.

so what should we learn from this?

some questions come to my mind and i would appreciate any further input.
1 - how do people feel about entering the water with only the one lp hose while in a dry suit ? i certainly do not think it is appropriate. but i can see why a diver might think that because this was an "easy shallow dive" that maybe this one time they might not really need it. if this was the case (not that i am in favor of diving with one lp hose) would the better option have been to leave the lp hose attached to the dry suit and manually inflate the bcd as needed ?
2 - does the instructor and / or other student have any role in this ? (i am not saying they necessarily do) but should we ask, was it ok to allow the diver to join them using only one lp hose ? that being said, perhaps they did not even realize this was the case at the time. but if they did know, would either of them have any responsibility to that diver ? particularly the instructor ? even if the diver was not their student ?
3 - i don't want to ignite a debate on whether or not to carry drop able weight but.....seeing as the computer showed the diver did mange to make it to the surface at one point, would having the ability to drop lead have prevented this loss ? (it is my assumption the diver had no drop able lead)

as would be expected, this tragedy was not the result of one simple problem but a series of choices and failures that added up to a sad ending. what are your thoughts ?
 
One of the skills you have to demonstrate when taking the drysuit class is to remove your weights and BCD. I would have thought that in shallow water a gearless CESA could have been accomplished. Perhaps panic or excessive suit squeeze prevented this. Very sad.
 
1. I have no problem with it provided you are diving a balanced rig, or relatively balanced *at least able to kick it to the surface*, and can orally inflate your wing properly. That caveat is that it is almost impossible to have a steel doubles rig where you can kick it up.
The inflator hose should have only ever been attached to the drysuit, and wing buoyancy should have been controlled via oral inflation. In the event of a failure like you described, if he pulled back the collar of the inflator, it would have shot the nipple out and stopped gas flow for the record.

2. not in my opinion, the instructor has responsibility for the student. A lawyer may disagree, but I'm not one. As an instructor, I would not have let him dive with us with that configuration though. Planned swapping of inflator hoses is bad news bears. If he wanted to dive and just leave it on the drysuit and use oral inflation for the wing I wouldn't have cared. I would personally have gotten my student to the surface, and dropped back down to the diver, shared air with him, and cut him out of his rig to get him to the surface, depth depending obviously as he's going up to the surface like a rocket.

3. in short, no, I don't think droppable lead would have done anything. Diver should have shed his rig as soon as he hit the bottom and calmly made a CESA

sounds like the diver panicked and that is what killed him, not any gear configuration issues
 
If the instructor allowed the diver to join them with the understanding that he was part of that group, then that instructor has a problem. That other diver now counts as a part of his or her student ratio, and there is an understanding that the extra diver is part of the instructor's responsibility. It is a serious risk instructors take when they accept "tag-along" divers with the class. Even a DMC (Divemaster candidate) counts as an instructor responsibility.

I do have a lot of trouble understanding the situation as described. I don't understand what you mean about the inlet fitting (etc.) It sounds as if a diver with doubles doing a very shallow dive, so shallow that he would not need to inflate his drysuit, and had a loose fitting that exhausted all the gas in his doubles before anyone could come to his aid. I am having trouble visualizing that sequence and would like more explanation.
 
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1. I have no problem with it provided you are diving a balanced rig, or relatively balanced *at least able to kick it to the surface*, and can orally inflate your wing properly. That caveat is that it is almost impossible to have a steel doubles rig where you can kick it up.

Not to go too off topic, but why do you say it is almost impossible to kick up to the surface with steel doubles?
 
Not to go too off topic, but why do you say it is almost impossible to kick up to the surface with steel doubles?
I certainly can't do it with my LP 108s. When I have new students with steel doubles, I have each of them dump all air in the wing and dry suit in the first shallow water training dive and head for the surface. Not one has made it yet.
 
I certainly can't do it with my LP 108s. When I have new students with steel doubles, I have each of them dump all air in the wing and dry suit in the first shallow water training dive and head for the surface. Not one has made it yet.

Oh yeah LP108's are big. I don't have any issue with my HP100's. I'm considering to go to HP133's, but not yet.
 
Why couldn't the diver remove the inlet fitting from the LP hose, connect the hose to his drysuit inflator and establish buoyancy? When diving steel doubles you should always have at least two forms of buoyancy and he really should have had separate hoses, but could have still survived with one.
 
I'm a little confused about the situation as well and where the gas loss occurred. If the LP hose popped off the wing there shouldn't be continued flow of gas.

Also, although some people have stated in the past they would still dive without an LP hose to their BCD in singles as they are comfortable orally inflating, I personally won't dive without one as when stuff goes wrong and people get stressed, balancing problem solving + oral inflation can lead to a bad outcome. In steel doubles, I was trained to always have redundant bouncy and so I wouldn't dive without a LP hose for both my wing and dry suit.

Finally, a lot of people do a manifold drill once or twice and never do it again. Part of diving BM doubles safely is making sure you can reach all your valves all the time - even if your suit is over inflated or completely compressed/empty. This takes a lot of practice so that you can do it quickly and in an emergent situation. Too many people "complete" a manifold drill but to complete it it takes them literally minutes and not seconds like it should.

TLDR: Don't dive without the proper equipment and training
 
I'm a little confused about the situation as well and where the gas loss occurred. If the LP hose popped off the wing there shouldn't be continued flow of gas.

The nipple that is supposed to be part of the power inflator - the part that the LPI hose snaps onto - broke off and was stuck in the end of the LPI hose. That is exactly the bit that let's air pass through the LPI hose and be controlled by the inflate button on the power inflator. So, yeah, gas would just dump until you either got the nipple out or shut off your gas.

If the guy got to the surface for a moment, he should have shucked his rig and dropped it then.
 
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