'Shaft' in the Bible

Then the fifth angel sounded [his trumpet], and I saw a star (angelic being) that had fallen from heaven to the earth; and the key of the bottomless pit (abyss) was given to him (the star-angel).

He opened the bottomless pit, and smoke like the smoke of a great furnace flowed out of the pit; and the sun and the atmosphere were darkened by the smoke from the pit.