Rise of the Tomb Raider: Survival Caches, murals, books - Planetarium secrets Rise of the Tomb Raider guide, walkthrough
Survival Caches, murals and books, Planetarium secrets, locations, tips
Survival cache 1

A moment after you enter the location, at the wooden wall, where you need to use climbing arrows.
Survival cache 2

A bit past camp Ceremonial pass, enter the water and swim slightly to the right.
Survival cache 3

You find it after you enter the upper part of the planetarium, where you need to prepare your path ahead, with climbing arrows. Jump down, below the wooden wall.
Mural 1

After you climb up to the main part of the planetarium, jump over to the other side, a small corridor on the left will lead you to the mural.
Book (document) 1

You cannot miss it. It is in the corridor that you get to after you set the planetarium into motion. Thanks to reading the book, you gain a new skill "Shooting class" (increases the fast firing of arrows to three).