Hi Nikb! I am pretty familiar, have several friends on LE dive teams, worked with many during Sierra's search, but by no means am expert in the field. I do know that there are time constraints and safety issues with deep dives. I will also say that after having seen the lake, I understand and it makes sense why they didn't go farther out or deeper down. I really don't see him having swam out that far to get to significant depth before sinking to the bottom. And as much time as the spent in the water and as many people were on that lake in the days after it seems really unlikely that he was missed by all of them.
Thanks for your valued input about dive searching since most of us do not fully understand how much is involved with it. The one thing I am wondering is how steep a drop the water drops off. Wondering if there is a steep drop off, then he could have maybe slid down to deeper depths. I think most of us agree he would not have swam out deep, but if there is a very steep drop off in that area, he may have slid down to deeper depths.
I suppose unless someone has seen a printout or a topographic map of the water area right around that specific spot, we may not know how steep a drop off. Those types of maps are available, but we would need to know exactly where on the map the car was found, and then maybe we could tell the steepness of the drop-off from a topo map.
If there is a very steep slope and drop-off, he may have slid down + out to deeper depths in the lake. This of course would then make it very difficult to find him.
I actually have a small john boat and a depth finder that shows an LED graph of the bottom, but am nowhere close to CA. One thing I was always amazed at was when certain lakes I fished at would have very steep drop offs in certain spots.
There was one lake that even if you were only 10-15 feet from shore, it had dropped to about 25 feet deep. You would never know this if standing on shore, because the shore line area looked normal. This one lake had quite the drop off.
Also, it is important to remember that there is always some structure and forgeign objects in lakes that he could of gotten snagged on below the water. A lot of fisherman will purposely submerge christmas trees, man-made structures, etc. to help fish have a shelter area to congregate. So, even if a lake is mostly smooth on bottom, there is always some structures that could be down there for a body to get hung up on.
With all that said, I do hope he is not in the lake, but for some reason, I just keep thinking about it more than the other theories. I keep thinking of the possible scenerio that he just waded in to get relief from his injuries and as he was in there, his succombed to his injuries and then floated a little bit before sinking, and then maybe slid down the slope of the lake bottom even further out to further depths.
Just a theory of course, and actually hope I am wrong and really hope he is alive somewhere.