While I was born in darkness, here at Peña Duro North we're bringing people into the light.— Bane
Peña Duro North Correctional and Rehabilitation Facility (better known as The Pit) is a prison run by Bane.
As opposed to Arkham Asylum that brands itself as a facility for the criminally insane, Bane expressed that the Pit is for the criminally capable, and a safe space where positive energies flow. He uses everything from therapeutic sessions and inspirational posters to rehabilitate the prisoners and channel their aggression into peaceful acts.
In "There's No Place to Go But Down" Bane (working as a judge) sentenced Harley Quinn and Poison Ivy to life in prison for the murder of Oswald Cobblepot after which they were taken to The Pit. Upon arrival, as Bane shows them to their quarters Bane reiterates the importance of them making their beds invites them to the talent show. Although they insist they won't participate after they hear that George Lopez will be choppering down for a ten-minute comedy set they conduct a plan to start a riot at the talent show so that they can escape in the helicopter in the confusion. However, as Harley plans her set to incite a riot, Bane arrives and notices that her bed wasn't made, and so bans her from the talent show and sends her to solitary confinement, guarded by Cheryl.
With Harley unable to follow through her part of the plan, Ivy takes her place but utterly fails to get a rise out of the crowd. Meanwhile, Harley manages to fight Cheryl and free herself just as George Lopez's helicopter leaves The Pit. No longer needing to put on an act, Ivy honestly vents her frustrations to the crowd and opens up to them which moves the crowd and makes them turn against Bane and The Pit, inciting a riot. The riot amassed a large mound of destroyed infrastructure at the center of The Pit, slowly creating a ramp in the direction of the surface which Harley and Ivy climb. Ivy gets high enough to see a vine in the side of The Pit, and uses it to pull herself and Harley toward the surface and despite Bane's best attempts to drag them back down, they eventually manage escape and traps Bane at then bottom of the pit below them.
In "Lovers' Quarrel" we see that Bane survived the fall down in The Pit and he's watching as Doctor Psycho broadcasts Ivy's memory of her and Harley sleeping together onto the sky from the bottom of The Pit.
- The Pit is likely a nod to the prison of Peña Duro which in most interpretations was the prison where Bane was born and lived the majority of his young life, becoming the most feared man in the facility until he became addicted to Venom and escaped. However, as opposed to the dark and violent place that created monsters like Bane, this version is depicted as a much more positive place with much more success in its rehabilitation.