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Good stuff. I also know someone who tethered himself to a wreck in current once while he relieved some leg cramps. Kind of like a reef hook. You can also use it to "dummy cord" various gear that you are working with mid water but don't necessarily want a lanyard on full time.Heh...I refer to jon lines as buddy lines, you can call'em what you want.
I always have the following back-up before entering the water:
additional weights
That's a first for me !!! Everybody I know is diving with the least amount of weight possible.
My "spare weights" are most often many millions of years old and found on the bottom - they're called rocks.