Down Below is an achievement in The Long Dark.
Guide[]
This achievement is easiest to unlock when playing on Pilgrim.
The player must find all 9 Prepper Cache locations in a single Survival Mode save file.
the Prepper's Abandoned Cache in Pleasant Valley ( 10th cache the player can find) does not count for this achievement.
Keeping track of visited Caches is quite easy if the player keeps a list in the General Notes notepad in the Journal.