What does Revelation 9:2 mean?
According to this verse, when Satan opens the shaft of the bottomless pit, dense, extremely hot smoke billows from the shaft. The smoke is so heavy and black that it darkens the sun and earth's atmosphere. The pollution that spews from the bottomless pit is an appropriate environment for the spiritually polluted fallen angels.The bottomless pit—the Abyss—is a realm of confinement for demons. When Jesus cast many demons from a man in the country of the Gerasenes, the demons begged Him not to command them to depart into the Abyss (Luke 8:31). While Jesus reigns on earth for a thousand years, Satan will be confined to the Abyss. Revelation 20:1–3 tells us John saw "an angel coming down from heaven, holding in his hand the key to the bottomless pit [the Abyss] and a great chain. And he seized the dragon, that ancient serpent, who is the devil and Satan, and bound him for a thousand years, and threw him into the pit, and shut it and sealed it over him, so that he might not deceive the nations any longer, until the thousand years were ended." The bottomless pit or Abyss is also mentioned in Romans 10:7, Revelation 11:7, and Revelation 17:8.