Ross enters HMP Belmarsh where he learns how staff deal with high-profile inmates, extremists and common criminals all living side by side. He also witnesses the effect of drug use on prisoners.

Ross visits the jail-within-a-jail at HMP Belmarsh - the High Security Unit. He then heads into the prison's healthcare unit where he meets a man who fought against ISIS. Elsewhere, Ross meets the only transgender prisoner at Belmarsh.