Plexiglass
Yeah, the plexiglass panels would kinda dampen the experience but I'm sure the sub staff have had to do that due to either safety or "sticky fingers" reasons.
It only takes one numpty with a magic marker trying to impress his girlfriend to ruin it for everyone else. Or some clown who figures "eh, noone will notice if I take this little piece as a souvenir".
I've visited numerous historical spots in Europe and elsewhere and I'm constantly stunned by the amount of graffiti (paint, ink and/or carved) one can find in the weirdest places in or on a historical place/item. It's sad but unfortunately there are many selfish, pathetic neanderthals who don't think about the consequences of doing something like that.
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