Exclusive: Letters from inside the underground H Unit of Oklahoma state penitentiary allege beatings, vermin, degrading punishment and in many cases no access to a most basic necessity – natural light Oklahoma prison criticized for allegedly incarcerating people in squalid underground cells with ...
Source: [Guardian International](https://www.theguardian.com/us-news/ng-interactive/2026/jun/11/oklahoma-state-penitentiary-dungeon-tombs-prisoners)