High Quality Content by WIKIPEDIA articles! HM Prison Aberdeen (formerly known as Craiginches) is a medium-security prison, located in the city of Aberdeen, Scotland. The prison is managed by the Scottish Prison Service. Known as one of the most overcrowded prisons in Scotland, it has a design capacity of 155 and is contracted to hold up to 230 prisoners. However, on the first day of an inspection in January 2009 it held 264 prisoners.