So after reading through this again, I am thinking part of the reason Joshua took offense is that I didn't distinguish clearly enough between comments that were specifically regarding his dive and comments which were more generally aimed at diver safety and human nature. I'm going to try to resolve that here by going back to his original post.
Here is where I'm talking about the story of your dive specifically...
Joshua Smith wrote:I saw my reel and smb sitting on the bench, and just decided I didn't need them for this dive. (cue ominous foreshadowing music).
You might wish you'd taken it and it might have been useful - you'll probably do things differently next time. But I don't feel this is the key to what troubles you about the dive.
Joshua Smith wrote:
We stopped for a second, and I noted that we were now at 110'. "Little too deep for the monolith, even on this high tide" I thought. I looked at my compass, and signaled Marc which way I wanted to go- he returned my signal, which seemed great- Marc's really good at navigation- when he agrees with me, I just *know* everything's fine. (Ominous music surges up a notch).
Here is the first sign that things are getting a bit wonky. You were probably both hearing ominous music in the distance, but I would've done the same as you - wrote it off as a minor variation in the plan that would probably self correct and I would've gone on as you did. I don't think this is the key moment either.
Joshua Smith wrote:
We stopped again, and I noticed we were now at.....127'!!! WTF! I was steering us towards shore, but we got deeper. By this point, I didn't give a damn about the monolith at all- I just wanted to get shallower, and maybe get out of this now EPICALLY crappy viz.
Here's the next sign. The plan is way off track now and there are some very real concerns that need to be corrected as a priority. You recognized it and I know I'd have felt the same urgency that you did. This is the key moment I think.
Joshua Smith wrote:
We repeated the drill- I took a heading, waved my light in the right direction, Marc confirmed, and off we went.
Here is where I think a bad decision was made. You had been navigating according to the dive plan and you'd seen that something was not working once, continued, saw the problem growing the 2nd time, and then you continued again. A friend of mine is learning to fly at the moment and his instructor told him something about being willing to make change in the plan. If something doesn't seem right and you're getting the feeling that the plan isn't working, make a distinct change that will get you somewhere that's safe to reevaluate your situation and calmly revise the plan. Persisting with a plan that's not working is probably not going to produce good results.
Joshua Smith wrote:
Probably a minute later (felt like half an hour) I saw that we were now at.....a hundred and forty feet. Oh, shit. I'm OK, Meg is working just fine, but Marc's P02 is through the roof, and I'm suddenly feeling very stressed.
At this point I was really not liking the story, and it seems like many others reading along felt the same.
Joshua Smith wrote:
I thought of my SMB and reel, sitting on my bench (Ominous music crescendos). Marc signals me that he's going up, and I gulp and nod. I *Hate* greenwater ascents. That's why I *ALMOST ALWAYS* carry a 425' reel and SMB with me- so I won't have to do one. I have shot that sucker from 200' in the lake before, during a dive that went sideways a few years ago, and I love it, I do. Amazing, the psychological comfort a piece of string connecting you to the surface can provide. But, oh well- I *can* do them, I just hate them- and we had to get Marc up to a reasonable depth ASAP. Around 100', Marc pulled out a bag and finger spool, and I swear, I almost did the underwater happy dance. YAAAAAY!
We've all had dives we weren't happy with: I've had a bunch where I looked back and thought "why the hell didn't I make a simple correction sooner?" I would like to think that at the key moment I mentioned above, I'd have made a different decision than you guys did, and that I'd have started ascending with or without a line. I can think of a bunch of dive accidents that involved compounding problems - the diver accepted a problem and went on, accepted another and went on - finally, another problem broke the camel's back and they could no longer deal with all the issues at once. I think you went a third round telling yourself that your dive would converge back toward the navigation plan and I think that you wish you hadn't, because it placed both of you in greater jeopardy.
Then the misunderstanding began. If I'd headed up at that "key moment" I mentioned, I'd have kept going until I got to about 30' before considering sending up an SMB if I had one available. I understand now that you felt differently and that having the line sooner became a psychological advantage - that can be a critical improvement. For me, stopping to send that SMB up earlier might have been the next problem - the one that put things in a downward spiral. I generally do pretty well with my SMB and my reel, but you and I have both screwed up operation of a simple compass, right? Shit can and does happen. It's a personal difference, possibly based on different experiences in our dives thus far. You made it work for you and I'm glad you both were able to turn things around and get control.
After that I got to wondering why you opted for that third round of erroneous navigation, and I saw a lot of reference to disliking green water ascents without a line - maybe that influenced your decision?
From here on I am generalizing...
I think that when most people start out diving (myself included), they feel some attachment to structure - it is a connection that they feel provides some assurances. I recognize it a lot when I dive at Keystone and see others there - newer divers do the same thing I did - they skim along at the bottom of the wall. With better buoyancy control and more confidence, most of us get away from that and get the full 3D experience. But I had dives when I made bad decisions under stress, and it was partly because that attachment to structure came charging back. I have watched other stressed divers do it too - I've seen the worry in their eyes, and then off they go, sticking to the wall or the slope and seeking safety. Sometimes they don't get there :( I hope that by having some stressful dives and recognizing this problem, I won't be so inclined to follow that instinct and that I'll choose to shallow up directly - at least to the point where safety is much closer to hand and I can take a moment to think free of stress and narcosis. If you are in a stressful dive situation and you feel that control is not yours, panic is looming and reduced depth is the biggest advantage you can get. Don't be tempted to try navigation when you're operating that way. Don't feel like you need to follow the slope back to the surface. Don't let any discomfort at being surrounded by nothing but green water cloud your judgement. Closer to the surface is the shizz - don't feel like you have to take the scenic route.
“When one tugs at a single thing in nature, he finds it attached to the rest of the world.” -- John Muir