Sci fi story had group of cadets dropped on planet with supplies. They were given a few admonitions and one was "beware of bomash". I made up the word, not remembering word used. They lived their year and had to eventually deal with bomash.
On debrief they asked the instructors about bomash....they said "there is always a bomash.....we had not specifically identified that hazard in advance". Lesson was be prepared to deal with a sudden new danger.
Lots of prep is kind of locked into bugging in, but many things we might end up needing to bug out