This file is generated by troggle using the form documented at the form documented at handbook/survey/caveentry.html
False Sonnscheinhöhle 1626 29 ARGE-or-VfHO 1626-29 a caves-1626/29/29.svx ARGE-or-VfHO cave.
3 lines of the survexfile, then all the *begin lines:

*begin 29
*begin Sonnscheinhoehle
*begin 1

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