The UIS symbol set for cave maps
and its possible extension for artificial cavities
Swiss Institute for Speleology and Karst studies; UIS working group survey and mapping
Cave mapping symbols had been unified and adopted by the UIS in 1999. They almost exclusively deal with “normal” karstic caves, and artificial caves (or human work in natural caves) are almost not considered. On request, the UIS working group now studies the possibility to add additional symbols specifically adopted to artificial cavities.