OK just a quick note because it may be pertinent to others, I made it from ground level to the water surface a difference of 60 meters (196 ft).
It looks like this:
### Latest WIP ###
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I can shorten up a bit if need be but I like it at this depth aesthetically. I wouldn't want to shorten it more than 10 or 15 meters though. (each striation line there should be about five meters down)

(ignore the roadway floating in the air there, it's got naught to do with anything, just a placeholder)