I've had this happen to me in the past on a different save, and earlier version of 0.8.

I'm not sure what causes it unless it's set to happen at a specific day or time (internal clock / ingame )

(edit, these forum formats are sort of shit and I'm not sure why it wouldn't let me add more)
I can't recall if I've seen anybody post or mention this in the past so I'm not sure if anybody else has had to sit through this before.

There's more text in the description of the video.

it's a random event, it puts you in an empty version of the base in a black void, if you jump into the void it teleports you back to the normal map
i'm not sure why the weird gray screen thing is happening though, might be a weird visual bug with the fog

this is intentional. extremely rare event.