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 Solution
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 There are 5 keys hidden around the station.

 1. Enter the regeneration bay near where you came in. Continue through the piston doors and up the ladder. Walk back
 into the station's main room through a doorway at the top of the ladder and open the chest on the balcony.

 2. Look behind the staircase across from the regeneration bay. It is located directly behind the glass.

 3. Under the hanging library there is a diamond block in the wall. Find a button (only a few blocks away from the
 diamond block) and place it on the block. This opens a door where you found the button.

 4. There is a raised platform with six levers on it. Flick the levers to change the state of the redstone torch under it.
 Match the torches with the torches on the wall above the water pipe and a compartment will open up at the base of the
 platform.

 5. Under the second staircase leading to the observation bay, there is a doorway. Walk through the doorway and press buttons
 until a door to the final key is open (all of the redstone torches have to be on for the door to open).

 Once you have all 5 keys, locate the observation bay if you have not already found it.