I guess I don't understand how you would define zero to almost hero. For NAUI Cave 1, Cavern is not a pre-req. It's a 5 day course designed to take someone without overhead experience to the equivalent of the apprentice level. Upon completion of the course, the graduate is allowed to dive 1/3rds in doubles with up to two navigational decisions at a maximum depth of 100' without going into decompression.
There are experience requirements prior to enrolling in the course, including 75 lifetime dives and completion of Intro to Tech (or equivalent). But let me restate for emphasis, Cavern is not a pre-req and at the end of program the student is allowed to dive up to 1/3rds and two navigational decisions.
It has it's place, but it's not a slow and steady progression program.
Intro to cave cards do not expire. The NSSCDS and NACD have a "Basic Cave" card that does expire, but it can be renewed. Same thing for the Apprentice card.
And there's something to be said about just doing some gold line diving to gain experience and move beyond the "holy crap! I'm in a cave!" heebie jeebies before progressing onto complex navigation.
Honestly, speaking as someone that took a ten year break from cave diving, I would be in favor of a card that expires unless you show you have had some recent experience. I think GUE requires you to do a certain number of dives per year to maintain a particular level, and having to go hang out with someone for a day once every 3 years just to tune up and demonstrate you still have proficiency doesn't seem unreasonable to me.



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shorts and a t-shirt
oops, a drysuit @ the 700' marker


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