| Clue | Source | Date |
|---|---|---|
| Type of prison, devised by Jeremy Bentham, with all cells visible from a central point | The Times Specialist Sunday | 24 Aug 2025 |
| Criticise choice after carbon enters circular cooler | Irish Times Crosaire | 12 May 2022 |
| Appoint criminal to study prison | ||
| Prison design that allows surveillance of any inmate at any time | New York Times | 18 Dec 2015 |
| Prison design that allows surveillance of any inmate at any time |