'Bottomless Pit' in the Bible

And the fifth angel sounded his trumpet, and I saw a star fall from heaven to the earth: and the key of the bottomless pit was given to him.

And he opened the bottomless pit: and there came up 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 had a king over them, the angel of the bottomless pit; whose name in Hebrew is Abaddon, and in the Greek tongue Apollyon.

And I saw an angel come down from heaven, who had 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 be finished: and then he must be loosed for a little time.