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It's really a matter of degrees. All dives are decompression dives. Within certain limits, you can avoid obligatory stops by coming up sufficiently slowly ... but even that restriction implies a decompression obligation that requires a certain level of skill in order to do safely.As far as I know...and I'm sure I will be corrected..."recreational diving" is defined by almost all of the certifying agencies as requiring no decompression obligation (a safety stop is not an "obligation," per se) that is not conducted in a overhead environment that is more than x feet from the nearest access to the surface.
Likewise a swim-through in Cozumel is an overhead environment ... no different than a cave except by degrees.
Before you run you must learn to walk ... before you walk you must learn to crawl ... but in the end it amounts to the same thing ... using your muscles to get from Point A to Point B. The distinction between crawling, walking and running is really a matter of degrees.
The distinctions you are making in diving are no different.
But I do agree that those who have just learned how to crawl should not be in a rush to learn how to run ... that's a good way to hurt yourself.
... Bob (Grateful Diver)