It can be unnerving to be on the surface in heavy chop. I don't think a snorkel makes things much better, since the water will break over the snorkel, too, if the chop is rough. If you are calm, it's not too difficult to time your breathing so that you don't inhale when you have your face in the water, but if you are frightened by the conditions, you may not be able to do this. And if you are trying to do a shore exit in rough water and get rolled, it's a VERY unpleasant experience.
That reminds me of my first dive with my new suit...
My buddy and I ascended at the breakwater at Ogden Point, and there was some chop. Not bad, you know how it is. When we got onto the breakwater to walk back, we both got knocked flat by a wave. Every time I tried to get up, I got knocked back down again. I was just repeatedly gooned onto my back and I was helplessly turtled.
This went on for about a minute. My suit was rubbing on the barnacles, there was kelp everywhere, I could
not stand up. I'm a reasonably strong guy, but there was jack all I could but ride it out.
Lucky for me, I had my reg in my mouth the whole time
because you told me to in one of your earlier posts. If I'd been trying to breathe atmospheric, I'd have been in a totally different situation.
We laughed about it in the parking lot. We figure it was the wash from a passing cargo ship or something.
Anyway, back on topic: there was a story here a few years back about a diver from Oregon who went OOG, got to the surface, panicked, floundered, and drowned. Ever since then, I've orally inflated my BC at the end of every dive.
Every dive.
Yeah, I get some water in my mouth and it was awkward as hell at first, but now it's as easy as you can imagine. It's worth a lot to have the confidence in knowing that you CAN get +++ buoyant and you're okay with little seawater in your mouth.
---------- Post added August 20th, 2013 at 04:10 PM ----------
I remember reading a DAN article some years back that claimed that, in a large percentage of scuba diving fatalities, the victim successfully reached the surface before subsequently sinking and drowning.
leading to the diver failing to attain positive buoyancy on the surface.
I still remember my OW instructor: "If you ever find yourself wondering if you should pitch your weights, pitch your weights. Then come find me and I'll buy you new weights."