You sure can state the basic diving logic ....but not all divers are as wise as you.
90% of divers are drifting off, looking at a hot chick or whatever, during a dive briefing...I have worked on day boats for 4 years and livaboards for 1 year...and it´s always the same. They all do the same ¨stupid diver tricks¨.
Anyway Gayle....I was doing a DAWN DIVE two weeks ago of Long Caye where the Instructor Corey died.........me and 8 guests, was dark as a night dive, guests are not obliged to dive with me, four did, the rest not.
Big down current, could not see any reference, boat was out in clear water so I instructed all divers on surface "dive/kick towards front of boat and follow mooring line". (knowing of course that you can never take for granted that divers would know this).
As I descended with the four divers who chose to dive with me....I notice the other four heading at a angle sort of away from boat, thus taking longer to reach the reef, allowing the down current to do its work, as I continued with my guests I was flashing my light at the other four trying to signal...when I hit the juncture of the slope and wall I was at 60 feet, the 4 guests in question were at about 110....this was in the space of 2 minutes time. I watched them until they found wall and ascended some and went about my dive, visibility was 30 feet. Could not reference the sun, (is a east/west wall) so kept an eye on compass.
Came up from the dive, 40 minutes or so.......took off gear, showered, put on clothes, 50 minutes gone, some slight concern...I told the captain that conditions were a bit tricky. We scanned the water, (by now it´s daylight), sure enough they pop up 200 yards away. No big deal, went and got them in the skiff.....
Guess what? All of the four were experienced divers....just like you Gale. Maybe not the 1000 dives you claim but all in the 200 plus range. Divers who could not account for current, basic direction, depth....
You see, what happens in unusual circumstances is most divers become stupid. They can´t use their compass because its dark and not real sure anyway how the damn thing works, forget to check gauges etc..
And I am sure this is what happened to my dead former collegue if he did not have a heart attack or some other natural cause.
He was a fresh instructor and had never dived in the ocean until he joined Nekton. I wrote above how on the first charter another new instructor on Nekton got lost at the exact same wall and had to be picked up by the skiff.....To be honest 90 percent of the instructors I worked with on the Pilot over a year (and there were a lot) were knuckleheads. Dopey kids or equaly dopey 30 somethings who decided to plop down $20,000 at PRO-DIVE for a "dive education", minimum number of dives to enter an IDC is either 50 or a 100 I forget off top of my head.
Forgot the point, anyway my fingers are tired....