Revelation chapter 9 speaks of a "Bottomless Pit" or "The Abyss" which will be opened in the end times.
It would appear from the Revelation of Jesus Christ that the key to this Bottomless Pit will be given to a fallen angel, so that he may open it.
Out of the pit will come smoke as if from a furnace, enough to darken the sun and air, and out of the pit will come "locusts" upon the earth, though it is clear that these "locusts" are not merely grasshoppers, but something far more wicked and dangerous and spiritual.