Spoiler Warning: This page may contain spoilers from the story of The Long Dark.
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There are several supply caches hidden around Mystery Lake. Most are left by hunters or campers. Some are left by off-grid "preppers" waiting for the government to fall, or the end of the world, or some such nonsense.
In-game description
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Mystery Lake Supply Caches is a side mission in Episode 2 of the story. There are six caches to be found in total. To unlock the individual tasks, one has to find a corresponding note or letter first.
To find the caches, you first have to find the matching note or letter. These can be found in the following places:
At the backside of the stairs at the entry of the Hunting Lodge; leading towards the Hunting Lodge cache. This cache contains a letter which unlocks the quest Aurora Hatch.
At a corpse leaning on the logs of a crashed log wagon of the log train in Forlorn Muskeg, near the entrance to the Broken Railroad region; leading towards the ravine cache.
On the desk inside one of the lake cabins (the one next to the cabin for which you need the key #2); leading towards the Clear Cut cache.
Inside a pickup truck next to a yellow train/engine near the collapsed bridge in the Broken Railroad region; leading towards the tree root cache.
On a metal desk on the second floor of the Carter Hydro Dam; leading towards the cache in Alan's Cave.
On the table inside the new Forestry Lookout; leading towards the cache near the entrance to Forlorn Muskeg.
Transcripts[]
Whenever Mackenzie finds a Hidden Cache, he will say a variation of these lines: