After retrieving an artifact from a mineshaft and getting to the surface the game crashed, the following was dumped to the debug.log
overmap.cpp[3876]: not found: s_hardware
overmap.cpp[3876]: not found: s_gun
overmap.cpp[3805]: oterlist[22346952] > 304
EDIT: Happened again:
overmap.cpp[3876]: not found: s_hardware
overmap.cpp[3876]: not found: s_liquor
overmap.cpp[3805]: oterlist[22346952] > 304