u/Kabti-ilani-Marduk

This is a somewhat impish question, but it popped into my head yesterday and I've been unable to dislodge it or provide a self-satisfactory answer.

The answer may overlap with the "Where do dead orcs go?" question, but might also suggest the existence of a "Hell" within the Tolkien legendarium. Is there any textual basis for a Hell? Some place where utterly unrepentant souls travel upon death?

Or do the Balrogs go to the Halls, and reside for a long while in some time-out zone where Mandos gives them plenty of space for growing out of their fire-and-ruin phase?