Herewith comments from someone who has never been in an underwater cave and probably never will because I am too sh#t scared... thus take it with a pinch of salt as I don't know what is involved.
I have seen many cave shots and I am always in awe of them because it looks so desolate and scary plus gives it always gives the perception of being exploratory. Therefore I feel seeing the line in the shots detracts from these attributes as it makes it look more like a beaten track.
On the flip side, seeing it like this probably makes it seem a bit tamer to non cave divers like myself to attempt cave diving.
Otherwise I like the pics but you will still not find me there!!!