Excellent discussion and good points raised. I posted this to an OC diving blog yesterday and thought I'd share here as well:
1. Personally, I use 3' as my line of demarcation. 0-2', no problem. 2-3', depends. 3' and over, cancel the dive.
2. Whether it's a "normal" entry/exit or an "oh-crap-the-surf-picked-up" situation (which you'd presumably discover as you prepared to exit), it's important to remember that the goal in all cases is to spend the LEAST amount of time in the surf zone as reasonably possible. More time in surf zone = more waves hitting you = more chances of something going wrong.
3. I perceived the impetus of the topic thread to mean the surf might be too big to exit safely as opposed to "normal" surf (since you wouldn't "normally" think about ditching your gear on the way out). Seems to me there's a slight blend of what you might do normally and what to do in an emergency. That being said . . .
4. I am NOT a fan of fins-in-hand on the way in or the way out. Not under "normal" conditions and definitely not under emergency conditions. Fins are going to be your ONLY way to provide quick mobility in the water. Not having them on your feet means you lose that. In big surf, I think that can be a big problem. Even in small surf, you need to stop and take them off (or put them on if entering) which means you're spending more time than necessary in the surf zone (see #2). Try "kicking" with just your booties some time and see which one you prefer.
5. At the risk of sounding too morbid, if the surf is too big to exit safely, it may come down to this: Lose your life or lose your gear, your choice.
6. And even if you ditch your gear, leave the BC fully inflated, tie the weights to the BC (if not weight-integrated), and just leave it all floating. It may wash in or perhaps it can be retrieved later. Ditching gear does NOT have to mean it sinks.
7. Use your reg all the way in, even if you're shuffling out or crawling out. (Obviously, you have to have saved enough air to do this.) That way, if you get dumped by a wave or submerged, you can still breathe. Not having to fight for air changes the equation in your favor.
8. Give some thought to NOT coming in. (Before you think I'm totally crazy, keep reading.) It seems to me that a lot of times when I read about dangerous or big-surf exits (as in "the conditions changed while diving and the exit is now much trickier than the entry"), everyone seems to think they HAVE to come in. No you don't. Stay outside the surf zone, inflate your BC . . . and wait. Maybe the surf will subside over time. Maybe a boat will come by and pick you up. Maybe you can signal people on the shore to call Baywatch and THEY'LL pick you up. (Or if you carry a Nautilus Lifeline radio, you can do that yourself.) Take off your BC & weights (see #6) and just float. You'll be plenty buoyant and by retaining your mask and fins, you've got mobility and the salt water will stay out of your eyes. One lesson learned from the Drifiting Dan case is that you can float in the water in SoCal for five hours and be rescued.
- Ken