If your going to be surface swimming a long way, I guess a snorkel could possibly come in handy, but you still wouldn't catch me using one. I'd probably swim on my back. the diving I do is mainly off a boat, or in a quarry assisting with classes. I usually wear the snorkel when assisting with classes to be a "good" example. I have no use for a snorkel when boat diving, it just gets in the way. I can't imagine any situation where a snorkel would save my life. If I'm lost at sea and the water is that rough where i'd "need" a snorkel, I'd bet it's not gonna do much good. Otherwise if I have a long swim I'd breathe from my reg or swim on my back (if I was out of air in my tanks) to the boat. I can testify that a snorkel can be a major inconvienence though. I dive a long hose, try deploying it with a snorkel on, it will invariably get caught up in your snorkel (it happened the other day when I was with a student on a checkout dive and gettin ready to do the octopus ascent). It also creates drag. Since it is situated right around where my power inflator lies, I've accidently grabbed the snorkel before to dump air and got a mask full of water. It's just another thing to get caught up on a wreck during a dive and create problems. If a snorkel works for you and aids in your surface swims, be all means, use one. I'm trying to stay as simple as I can in my gear configuration, and a snorkel does not fit into my equation.