Very rare footage as Chinese govt seldom lets footages or photos of detainees leak out. This is important evidence showing ongoing abuses of Uyghurs on the basis of their identity, of their ideas https://www.bbc.com/news/av/world-asia-53657604/video-filmed-by-uighur-model-mergan-ghappar-inside-china-s-detention-system

The practice of chaining detainees to their beds, and of chaining their hands and feet together as described by Mergan Ghappar, is common in Chinese police detention system and has been documented by @hrw both in Xinjiang and across China: https://www.hrw.org/report/2018/09/09/eradicating-ideological-viruses/chinas-campaign-repression-against-xinjiangs

Among other lowlights, Mergan Ghappar described how police beat teenagers for venturing outside to play during COVID in Xinjiang, suggesting draconian law enforcement in that region: https://www.bbc.com/news/world-asia-china-53650246

And here's @JimMillward's translation of Mergan Ghappar's ordeal: https://medium.com/@millwarj/wear-your-mask-under-your-hood-an-account-of-prisoner-abuse-in-xinjiang-during-the-2020-3007a1f7437d. This testimony is also rare because it's a recent account--from early 2020-- detailing treatment of Uyghur detainees during COVID.