Easter Egg + Achievement (Spoilers?)

The title of this thread is a spoiler you fool!
 
Many people have found it. I actually stumbled upon it because I couldn't figure how to freaking solve the actual puzzle.
 
Note that the 3 recordings of Cave are talking about the 3 other doors. It seems possible that the teleportation experiment that doesn't work with all skin types *could* be referring to the Borealis, but I don't think we can simply assume that is definitely the case.
 
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