I added to http://wiki.openstreetmap.org/wiki/Cave#Tagging_in_OSM how these may be mapped ("tunnels that are available for humans but closed for typical tourists may be mapped as highway=path with tunnel=yes and access=private, and routes available for tourists as highway=footway (highway=steps) with tunnel=yes").
I think that it is an obvious idea, but wiki claimed that "At the moment there just a tag to map the entrance to a cave." despite fact that existing tags fit well. I am pretty sure that it is a good idea, but maybe there is some superior scheme or I missed something. Example of cave tagged this way is available at http://www.openstreetmap.org/?mlat=50.17416&mlon=19.80670#map=18/50.17416/19.80670 I wonder about adding something that would denote that way is part of cave, maybe natural=cave_tunnel?
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