So I will offer a guess as to what happened in this video that led to the panic. My guess is based on something I saw once myself.
Let's start by looking at what we see.
We see divers in cold water gear at the end of a dive--they are giving the thumb to begin the final ascent. Everyone seems to be fine, swimming calmly with neutral buoyancy. Suddenly we see one of the divers is significantly deeper than the rest, deeper by far than she was only a few seconds ago, and she is struggling to ascend, struggling, in fact, to stop her descent. Unable to do so, she panics.
Some years ago I had a student I had never met in in an AOW class. She had newly moved into our area, and this was her first time wearing a 7mm wet suit and hood. At the end of our first dive, I signaled the ascent, and she immediately raised her inflator hose, dumped all her air, and started to plummet into the depths. I caught her as quickly as I could.
When we got to the surface, I said, "Let me guess. Your OW instructor taught you that when it was time to ascend, you are supposed to dump all your air and swim up, right?" She said, "Yes, isn't that right?"
Many warm water instructors with students wearing 3mm suits with minimum compression at depth, teach that silliness.
I didn't notice that. If this clip was staged then it was staged very well, but assuming that what we are seeing is real then what I noticed was the following:
a) I'm reading this as a training situation. I'm not sure if this is true or not, but the person filming seems to be leading the dive and the diver who got in trouble is clearly so inexperienced that they seem to be a student.
b) at the 15 second mark he signals to everyone to initiate an ascent but this student (I presume it was a student) was not "engaged". She was looking away, not communicating and at that point already sculling with her hands. A student who seems to be unaware of what is going on around them gives me warning bells. These things can be obvious indicators of stress and in any event he shouldn't have been initiating an ascent without double checking on her state of mind. So already after 10-15 seconds we are seeing trim issues, communication issues and situational awareness issues on the part of the "student". Why the dive leader would ignore that is, frankly, hard to understand.
c) The sculling with the hands was already happening when she was more or less horizontal. This indicates that either something is wrong or they had never worked on proper trim with her and she had grown accustomed to swimming with her hands. This impression is reinforced a few moments later, as I will point out in a second. This is another indication of trim issues and possibly stress, but in any event indicative of someone who is not yet comfortable in the water. Someone who was still doing this should never have gotten out of the pool. This may not have been the fault of the person leading the dive if she wasn't actively in training, but if I were in that position, I would have been getting alarm bells and I would have kept much closer to her for this reason.
d) the protocol for ascending in the PADI system begins with communicating intent (signing to go up) and the other buddy either repeating the sign or giving an OK. Personally I teach for both buddies to repeat the sign so that there can't be any confusion about what we're doing. The person filming (who I assume was leading the dive) did not wait for a response but initiated his ascent without ANY communication from the diver in question that this is what we are doing. To say the very least, this is sloppy. This indicates *severe* performance and communication issues on the part of the person leading the dive and he/she is very lucky that this lack of competence didn't cost that young woman her life.
e) The sculling with the hands appeared to get worse as she was trying to ascend. This is clearly visible at about the 35 second point. At this point she is vertical, which seems to indicate that she understood that she needed to ascend but the sculling with the hands had gotten a LOT worse and she was "bicycle kicking". Breaking that down, she was clearly trying to "swim up" with her hands because the way she was kicking had obviously not been addressed during training. Moreover, and this is very VERY disturbing, the rhythm of the sculling with the hands is *alternating* at this point. That's a clear "PANIC" sign because it indicates that the diver's brain is now in a mode like "treading water". When treading water, your brain wants your head out of the water. When this wasn't happening, the main short circuit started to happen.
f) To the benefit of the person filming it was apparently clear that the diver was in difficulty at that moment because he descended again, presumably to intervene. However, because he had initiated his own ascent too early, he was too far away from the diver in question to get there on time. Because of this, her problem ascending quickly escalated into a life threatening situation. This could have, and should have, been avoided by adhering to proper ascent protocol.
g) The diver's buddy, who had made a fairly solid first impression in the first moment of the clip was closer but also was not ascending in tandem with the diver who got in trouble, indicating once again, the sloppy protocol and lack of communication that would have prevented this. In addition, by the time he had figured out that she was in trouble, he was also too far away to get a hand on her.
h) during the ascent it became too chaotic to see what the divers were doing but it was clear that the diver who was panicking was no longer in a state to think through any solution. She also rejected the regulator once put back in her mouth. How she didn't either hold her breath from that and get an lung barotrauma or drown during the ascent is quite beyond me. To me it looks like she DID hold her breath but perhaps her lungs were not full enough from her last breath on the regulator for it to cause an over-expansion injury from that depth. Nothing the person filming did during the last part of the ascent would seem to have made it any better or any worse. This is, of course, a graphic reminder that if you don't put your energy into avoiding problems, that fixing them might not be an option.
All in all, I'm seeing the things you would suspect.
- bad trim
- bad buoyancy control
- sculling with the hands
- bicycle kicking
- lack of communication and adherence to protocol
(summarized: bad skills)
- leading to stress, leading to panic and leading to what I believe was a completely avoidable accident. I'm going to go ahead and call it an accident because the *only* difference between this and the many fatal accidents we talk about on Scubaboard is that the diver didn't die.
R..