Phillipians 2: 10-11

So when His name is called,
every knee will bow,
in heaven, on earth, and below.

And every tongue will confess
"Jesus, the Liberating King, is Lord,
to the glory of God our father (The Voice)

that at the name of Jesus every knee should bow,
in heaven and on earth and under the earth,
and every tongue confess that Jesus Christ is Lord,
to the glory of God the Father. (NIV)

That at the name of Jesus every knee should bow, of things in heaven, and things in earth, and things under the earth;

And that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father. (KJV)

Here Paul is discussing how we should love one another and be servants towards one another, because Christ humbled Himself by becoming our servant unto death, and we ought to be willing to do the same for our fellow man.

But what does this last part mean? God exalts Christ above all so that everyone, on earth OR UNDER THE EARTH shall both bow and confess that Jesus is Lord.

Again, I take ALL to mean ALL. Every to mean every.

Even the people living at the center of the Hollow Earth. Everyone will confess that Jesus is Lord, which means, sooner or later, everyone is going to be at the party. See ya there :)