'Bottomless Pit' in the Bible

And the fifth angel sounded, and I saw a star falling from heaven upon the earth, and to him was given the key of the bottomless pit.

And he opened the bottomless pit, and there arose a smoke out of the pit, as the smoke of a great furnace, and the sun and the air were darkened by the smoke of the pit.

And they have over them a king, the angel of the bottomless pit: his name in the Hebrew is Abaddon, but in the Greek he hath the name Apollyon.

And when they shall have finished their testimony, the wild beast that ascendeth out of the bottomless pit, shall make war with them, and conquer them, and kill them.

The wild beast which thou sawest, was, and is not, and shall ascend out of the bottomless pit, and go into perdition: and they that dwell on the earth, (whose names are not written in the book of life from the foundation of the world) shall wonder when they behold the wild beast, that he was, and is not, and yet will be.

And I saw an angel descending out of heaven, having the key of the bottomless pit, and a great chain in his hand.

And cast him into the bottomless pit, and shut him up, and set a seal upon him, that he might deceive the nations no more, till the thousand years should be fulfilled. After this he must be loosed for a small time.