Notes & Toys in caves (i.e. Trash)
In my opinion anything taken into these amazing places and left behind is trash. If there were any possible way to safely go into these caves without our nylon line, plastic line arrows and cookies, I would leave them on the surface, BUT since we do want to get back to the surface.......they are a necessary evil.
We create enough impact on these sites by simply going into them. Leaving our trash inside is an insult to nature.
I believe the only thing that should be left in the cave is line, arrows and necessary dirctional markers. Even survey markers should eventually be taken out after the survey is finished.
I also think that the only historical markers are the lines and arrows left behind by the original explorers. They should never be taken out of the cave. The exception to this would old deteriorated lines, but old markers should be placed on the new lines in their original positions.
Safe diving,
Brian