Well, this thread didn't take the path I hoped it would. I was curious to find out what speculations would have been made if I had died, based on the facts as presented. Anyway, here is what happened - and I learned a huge lesson (so did Leah). So, actually, it has made me us much better divers. I have a great respect for water and what it can do. Here's what happened:
We were very tired after diving across the lake. We were also starving after 6 or so hours of diving, lugging gear, etc. We ate a big lunch right before the dive. We should have not even attempted this dive, and the biggest lesson I learned through all this was that I should have called the dive. I didn't feel like doing another dive, but I guess the excitement (and the opportunity) to do this one last thing overshadowed my judgment.
A big problem I was having all day was a very leaky mask. I was having to clear it very frequently. That was signpost #1 I should have paid attention to. I was very fatigued (signpost #2). I realized shortly after submerging that this plastic lawn chair took on all the aspects of a dead elephant underwater, but I was determined to get it to the bottom (signpost #3). The newb in front of me got his fin caught on the guideline, and he was madly shaking the line to release himself. I motioned for him to stop, finned over, and unhooked his fin. He took off like a bat out of hell. So, I raised my head to clear my mask (again), and it had so much water in it that it immediately went up my nose. At some point I decided to let go of the chair, which shot to the surface. The water in my nose choked me so badly that I gagged and dropped my reg. I'll admit that I did panic a little, because I forgot to purge my reg before I inhaled a huge breath of lake water. I tried to cough and recover - my body wouldn't let me respond (I later found out that it's a defense mechanism for your larynx to paralyze to prevent more water from coming into your lungs [correct me TSandM is that's not entirely accurate]). So, in the seconds immediately following, which seemed like minutes, I thought to myself "you gotta get to the surface." So I inflated and shot up like a rocket. Thank God I suffered no ill effects. What went wrong?
1. I was fatigued.
2. I was task-laden dragging that chair.
3. I was dealing with an equipment failur (leaky mask).
4. I was alone.
5. I paniced.
I think that pretty much covers it. Leah and I have talked about it on several occasions. That's why we are so dedicated to staying with each other - although I let her down on that one this past summer. I was hanging on a line with the guys who had just dove the lodge, Leah signaled up, and I let her go to the surface by herself from 70+ feet. Not only did she go alone, but I, too, had to go alone when it was time for me to surface. The fact that I was abandoning my dive buddy didn't even come to my mind. Stupid. We have both learned a lot - mistakes I will not repeat again.
I guess the point of my original post was to see what conclusions and speculations people would come up with if indeed I had died. Even Leah, who had been diving with me that day, probably couldn't have accounted to anyone accurately what really went down. She would only have had a few of the facts.
Looking back on it, though, I'm glad it happened. I certainly don't have a cavalier attitude about diving. It's fun, but it's serious business - and can be deadly serious if you don't pay attention to everything (your energy level, your equipment, your buddy, your head telling you that something is stupid). I hope that someone reading this will learn from this experience.
Be smart and be safe!