23 December 1998,
An activist dressed in Olentzero chained himself in a window of Algeciras prison requesting the Basque Repatriation of Basque prisoners. With a picotta he also started to knock down the wall. When the Spanish police tried to identify the three people who participated in the action, the chained man was identified as Olentzero and taken in custody.
Source:
Euskaldunon Egunkaria (24 December 1998).