All that I can remember of this dream is that it involved various people from different time periods being stuck underground.
They were somehow paralyzed and / or petrified and / or being held in some kind of stasis and / or something strange-like that.
Someone figured out how to break the paralysis / petrification / stasis / whatever, and they told the character Grey Worm or another Unsullied from the television show Game Of Thrones or someone similar to them.
Grey Worm or another Unsullied or whoever then did what they were told, this worked, and slowly the people started being able to move.
Then they started using a ramp to return above ground, but that is all that I can remember of this dream.