that green wire might just be a really bad pull job. I think that it is just looped there. Regardless, this should just all be re-rewired to make it less awful.
The garden hose idea isn't that bad, however, provided that it is for low voltage and temporary use only. I have a fiber cable run inside a garden hose that I use for really long runs where twisted pair wouldn't work. I use it a lot for outdoor concerts if were streaming audio on the web. It is only for temporary stuff, though.
