added internal links and refs
Lucifer is imprisoned separately from demons, in what is called [[Lucifer's Cage]], and is held captive by the [[The 66 Seals|seals]].
It appears that hell is split up into sections. In a recent interview with Sera Gamble it is
revieled that Lucifers cage is in fact the 9th circle of Hell. This section of hell is the worst and according to Sera Gamble not even Archangels can escape without a door way being opened from the outside: eg 66 seals or Horsemen rings. Other evidence is when Azazel contacts Lucifer and states that Lilith is "trapped deep, deep within the pit". Another is when Sam and Dean trap a demon and Dean states "send him somewhere were he cant hurt anyone". Also lesser/ weaker parts of hell allow Demons to "slip-between-the-cracks" and enter our plane. Eg Meg, Azazel and Alastair. However, its weird that a Demon of lilith's stature couldn't just simply teleport herself. She herself is far more powerful than Alastair and he can travel between Earth and Hell with ease.