Maybe one comment regarding the different gas rules that come with various flavors of Cave 1 / intro to cave / etc:
It was pointed out above that a gas rule of 1/6 can be very limiting, and that hence it's better to go for full cave straight away. I disagree, and the various reasons for getting experience along the way have been mentioned already in this thread. I'd like to add another angle:
First, there are Cave 1 flavors that give you more gas, e.g GUE Cave 1 is 1/3 of 2/3 (so somewhere between 1/5 and 1/4).
Second, and more importantly, if you pick a place with shallow cave such as Mexico, there's lots and lots to see before you hit that gas limit. Many beautiful caves there are between 6 and 12 meters depth, so with doubles you easily get 30min+ penetrations resulting in 60-80min dives on Cave 1 limits. That's quite a lot, and once you experience how much longer it takes to get out in zero vis, or gas sharing or ... you will appreciate that it's a good idea to not be hours back in a cave straight away. I didn't find the gas limit very limiting between Cave 1 and Cave 2. The thing that bugged me most, was the curiosity of whats on the other end of those jump lines. Not because I ran out of cave to dive on C1 limits, but more because you swim past so many "doors" that you always wonder what's behind them.
I'd also like to add a perspective on the "rigid" nature of GUE classes and methods. Not to claim this is superior, but just to further the understanding of their nature, for folks who haven't taken the classes yet. (any present instructors please add your views, I'm speaking from a student perspective only).
Simply put it goes like this:
- Fundamentals: We want to give to tools that we know work for us. Please do it like this. The reason is XXX. Try for yourself. There may be other methods, but for now we ask you to master this way first before getting creative. Get the basics down in a solid way.
- Level 1, e.g. C1: Let's use the fundamental tools to do cool/useful stuff. You’re new to this, so please do it the way we know works. Build muscle memory for the worst case scenario instead of experimenting, you will be thankful for it. In the worst possible scenario, you can rely on something tried and tested.
- Level 2, e.g. C2: You want to become a grownup cave diver, and you’re old enough to make smart decisions. You have a question how to do something? Well tell me first what you would do if you were on your own. After that we can share our view if we think differently. By now you have min 35 cave dives using the “rigid” tools and you know what works and what doesnt. If it really doesnt work for you, lets discuss. Understand that sometimes you need to be flexible. You should always think, and know why you do the things the way you do. Be aware that for some situations there is no optimal/right solution.
So to cut a long story short, it does start out in a more “rigid” way, but becomes more flexible. It starts with “please do this!” and finishes with “what do YOU think?” And I think the logic behind doing it this way is sound. If you’re brand new, you shouldn't get creative in a cave. Maybe some folks who havent been through that journey misunderstand, and think the whole system is some kind of anti-fun military thing, Gerorge Irvine style all the way. I can only speak from the few classes I’ve taken, but Ididnt see any “rigid” “military style” anywhere ...