Note that although red light "disappears" from the spectrum when you go deeper than about 6 to 10 feet, that doesn't mean red things are invisible. The red just looks dark brownish. If you have ever gone deep underwater either diving or in a sub with ambient light, you've seen this firsthand.
So the cajun line isn't truly invisible underwater. It just turns kind of brownish. Some fish don't care about high-vis lines - after all, Stren used to be bright fluoroescent yellow years ago, and it caught fish. But line shy fish still may shy away from the brown line.
If you want line that's truly invisible underwater, clear fluorocarbon is what you want.
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