'Bottomless Pit' in the Bible

And the fifth angel sounded; and I saw a Star fall from the heaven to the earth; and there was given to him the key of the bottomless pit.

And he opened the bottomless pit, and smoke ascended from the pit, as the smoke of a great furnace: and the sun and the air were darkened by the smoke of the pit.

For they had a king over them, the angel of the bottomless pit, whose name, in the Hebrew language, is Abaddon; and in the Greek, he has the name Apollyon.

The beast which you saw, was, and is not; and he will ascend out of the bottomless pit, and go to destruction; and the inhabitants of the earth (whose names are not written in the book of life, from the foundation of the world) shall wonder, seeing the beast who was, and is not, yet shall be.