[Iscool]

That portion of hell where these spirits were imprisoned is called the limbus or border, of hell.

That place is called Abraham's Bosom...And it's empty...Hasn't been any souls there for a couple thousand years...

[wideawake]

That place is called Abraham's Bosom...

Abraham is there no longer.

And it's empty...

It is certainly empty of the pre-Incarnation patriarchs. The name limbus patrum literally means "borderland of the fathers" i.e. Adam, Abraham, Moses, etc.

Hasn't been any souls there for a couple thousand years...

That's precisely the question at issue - do the souls of unbaptized infants go to the lake of fire, to heaven or to a place like the Bosom of Abraham of former times?

This is a matter the Church has not defined dogmatically - it is a speculative matter, mostly because it does not pertain to the salvation of believers, but to children who were not old enough to consciously believe in Christ.