Tartarus (hell in 2 Pet. ) means the deepest pit. Naturally, it is also under the earth. The bottomless pit is also under the earth (Rev. ). So Philippians means that the Lord Jesus is the Lord over everything in heaven, on earth, and under the earth, for there is a spirit world under the earth.

May 28,  · What does "things under the earth" refer to in Philippians ? 9 For this reason also, God highly exalted Him, and bestowed on Him the name which is above every name, 10 so that at the name of Jesus every knee will bow, of those who are in heaven and on earth and under the earth, 11 and that every tongue will confess that Jesus Christ is Lord, to the glory of God the Father.