What's the DIR stance on using (or why not using) snorkel?
What's a snorkel?
Oh yeah, that thingy I gave to my nephew to play with in the pool!
Seriously tho, I can only think of one dive that I even remotely wished that I had one and even then it wasnt a big deal. Environmental conditions like long surface swims or rough seas are taken into account when planning the dive, so it becomes a essentially a non issue.
The only time i can remember wishing for one was during a SI on the Oriskany. Someone dropped lost a camera or something and it floated off way behind the boat before anyone noticed it. I jumped in with fins and mask after it and it took a pretty long swim to get to it.