Some prisoners committed murder in order to escape, as murder was punished by death at the time. The only connection to the mainland was guarded by half-starved guard dogs, soldiers and man traps.
What made an unforgettable impression on me was the silent system that was implemented in the Separate prison. The prisoners were hooded and made to stay silent as to reflect upon the crime they were being punished for. As a consequence many prisoners developed mental illness, and an asylum was built right next to the Separate Prison. The area is magnificent and the events that happened there is a truly eye-opening experience. Entry to the area starts from $30 without a guide. It is also possible to join a guided ghost tour by night.