In your opinion, what is the location of the Bottomless Pit? Is there a definitive answer in the Bible?
The bottomless pit is a term which occurs in Revelation 9 of the New American Standard Bible translation :
The term “bottomless pit” is actually the Greek word abussos, which is usually translated “abyss,” which occurs several times in the New Testament. The abyss is the holding place for the disobedient angels that followed after Satan (commonly called demons). The abyss exists side by side with Sheol, the Old Testament name for the holding place of souls. The exact location for these places is clearly explained in Scripture:
These verses all point to the same location for Sheol or the pit: at the center of the earth. Since the Bible consistently refers to Hell/the pit/the abyss/Sheol as being at the center of our physical earth, we must accept that testimony, since we have no reason to reject it. There is no basis in the text of Scripture for dismissing a literal interpretation, nor is there any scientific basis on which to reject this conclusion. What little we do know of the center of our earth, we do know it’s very hot, which is consistent with the Bible’s description of Hell:
Finally, you might find this recent article on the inner earth interesting: The Deepest Hole We Have Ever Dug