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Help this newbiw understand...
what is a "wall"? a "water column"?
Just thought of something else- what is the difference between a regulator and an octopus?
A wall is basically like an underwater cliff. Unlike the surface, where you start at the base of a cliff and go up, on a wall, you start from the top and go down over the edge of it to whatever your planned depth is. Walls are typically the delineation where the shallower shoreline drops into the deeper part of the ocean. The top of them may start as shallow as 20-30' and in some instanced drop off for thousands of feet.
The water column is basically all the water from the surface to the bottom. When people talk about their position in the water column it's usually related as depth from the surface. ex. on a 60' dive, someone in the middle of the water column is at 30'.
An octopus is a regulator, but that designation is typically given to your back up regulator for recreational divers, rather than the primary one you're breathing off of. Many of us use the term backup regulator vs. octopus.
Walls are fun! It's especially fun to swim along the plateau at the top of one, and then swim off the edge -- you feel as though you are flying.
I think you have probably heard folks talk about doing skills "in the water column", which is referring to doing them while floating, rather than while kneeling or sitting (or, Heaven forbid, standing) on the bottom.