Ride the boat from the north dock to the Safehouse. Note: Changing the water level again will close the access to the safehouse. Content Sanctum Key Metro Plan Museum Plan Safehouse Letter Picture of cracked wall Drawing of monitors Picture of three people Categories. Looking to unlock every hidden door in The Blue Prince? You'll need to collect all the Sanctum Keys scattered throughout the game. In this guide, we'll show you where to find every Sanctum Key, what you need to do to get them, and how they help you progress through the game.
Points of interest Items There is a Sanctum Key on top of the letter detailed below. Documents There are quite a few features and documents inside the Safehouse: On top of a crate between two bunk beds, there is a picture depicting a cracked wall between two columns.. Once you have reached the underground area with the lever to access room 46 in Blue Prince, you will find eight locked doors that require keys to open