'Bottomless Pit' in the Bible

And the fifth angel sounded, and I saw a star fall from heaven unto 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 darkned by reason of the smoke of the pit.

they had for their king the angel of the bottomless pit, whose name in the Hebrew tongue is Abaddon, but in the Greek his name is Apollyon.

when they shall have finished their testimony, the beast that ascends out of the bottomless pit, will make war against them, overcome them, and kill them.

the beast that 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 were not written in the book of life from the foundation of the world, shall wonder when they behold the beast that was, and is not, but shall be.

Afterwards I saw an angel come down from heaven, having the key of the bottomless pit, with a great chain in his hand.

then cast him into the bottomless pit, there shut him up, and set a seal upon him, that he should seduce the nations no more, till the thousand years should he fulfilled: and after that, he was to be loosed for a short time.