This file is generated by troggle using the form documented at the form documented at handbook/survey/caveentry.html
False Grushöhle 1626 - 52 not-CUCC-Expo 1626-52 caves-1626/52/52.svx not-CUCC-Expo cave.
3 lines of the survexfile, then all the *begin lines:

*begin 52
*begin Grushoehle
*begin 1

*begin 2

This is an ARGE or VfHO cave where we only have the survex file and no other information