Well, what could go wrong?

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What if they just flew in that morning
Not a problem, but going to the airport straight from the boat with wet hair might be. :pilot:
 
The answer is anything outside of the conditions described could happen. They are acting as they should and as they were trained so the problems that could occur would be something outside of that.

Human nature...one moves just a little too far away...just for a minute...just as the other had a lp hose go.

One is tangled due to being around kelp/nets/line while the other is distracted with an up/down draft and poor viz.

One has a health problem which causes the other to lose their normal calm, cool demeanor.

Obviously, when everyone is prepared and in control you have to reach a bit to come up with a long list of deadly scenarios.

It's rare than someone in a scenario as described does have serious problems other than health problems. The closest local example I can think of that COULD fit your scenario would be the guy who died just off the beach at the Alki Pipeline.

I know there is another way to describe what happened there but it's still the closest death that I recall reading about that occurred under such benign circumstances.

It's a bit like people drowning in their bathtub...slip and hit your head just right and you drown in inches of water.

Slip on a low tide day getting in at Cove 2 and you could drown even if your buddy was right there if luck wasn't on your side that day. In most cases you would be revived or not actually drown but luck is not always on our side.

No one would have ever predicted that Steve Irwin would die the way he did...other's ways perhaps but not from a Sting Ray.
 
Rob, thanks. You came up with a good example, where good planning and careful execution got short-circuited by somebody's failure to have dealt with a known weakness.

Gray, that fatality at Alki might well have been avoided if the victim had taken the step of inflating his BC before getting near the water, which is something I stress to student divers when I am doing the DM thing.

A blown hose or clogged dip tube would definitely precipitate an emergency, but assuming that Bob and Karen have practiced sharing gas AND are using good buddy skills (which I think was in the original scenario) it shouldn't become an accident.
 
Most accidents don't occur because something goes wrong - they occur because of (i) diver error, (ii) multiple things going wrong, or (iii) both.

If you asked me to add the least additional facts to Lynne's story to create the most probable diving accident (based on my experience) I would go with: "Whilst climbing the ladder back onto the boat, Karen lost her grip and fell backward. Bob had unwisely stayed too close to the ladder, and the butt of Karen's tank drove through his mask and/or broke his nose."
 
While I recognize that "most accidents" can be attributed to "pilot error" and cascading problems, in my (limited) experience that has not been the case. I've only been involved in two situations that could be aptly described as "disasters", but in both cases they could not be attributed to the previously described causes. In both situations, the dive was planned and executed completely according to the book, right up to the moment all hell broke loose.
That said, the question is a great one, and exercises like this one are terrific in stimulating divers to consider the "what if's" of practically any situation. While some feel this is "disaster thinking" and a source of needless stress, those of us who have been in stressful situations (in my case, firefighting, rescue, and medical situations) know that it's an essential part of being prepared to imagine just such scenarios and consider multiple strategies that could be employed to cope.
Great thread, TS&M!
 
I got up this morning alive and feeling fine. What might happen to me today.
 
They look at the planned depth of 100 fsw, with a multilevel profile, coming up a wall. They compare that profile to their own gas consumption on their HP100 tanks, and conclude that this is a dive they can do. They make a plan for maximum bottom time at depth, and sketch out a desired profile.

The phrase "maximum bottom time" always sets off an alert for me. I prefer to plan my dives well on the conservative side of both gas and NDL leaving some room for error on one or the other, or both. If I choose to push one or the other, I like to go with a bit more planning and probably more gas.
 
He is going up the ladder and she is directly below him, he slips, falls backwards and nails her on the forehead with his tank.

delete, I missed the earlier post
 
The phrase "maximum bottom time" always sets off an alert for me. I prefer to plan my dives well on the conservative side of both gas and NDL leaving some room for error on one or the other, or both. If I choose to push one or the other, I like to go with a bit more planning and probably more gas.

Dido. I am sure the question was pointing us to gas planning and/or decompression (ascent) issues...
 
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