Since Jesus became sin so we would become the righteouness of God . He went in our place . He went where all of us should have went . the heart (meaning the direct centre of any object) of the earth is very fiery and magma-y is it not?
and i find the end hypothesis more of an off the cuff remark than a researched fact . that the lake of fire will not be there in the new heaven and the new earth because it is mentioned after the judgment as the place where the sin infected stay so the new creation is not infected also .
but very interesting Michael, thank you for the food for thought .