The Limestone Quarry was first mined during the Dutch colonial period. It is situated inland South West of Murray’s Bay Harbour. In 1963 political prisoners from the general section were forced to work at this quarry. At a later stage, the B-section prisoners (called the Leadership section) from the Isolation Block were made to work here and the general section prisoners were moved to the Bluestone Quarry. Most of the limestone excavated from this quarry was used to resurface the Island’s roads. Following practice on the mainland, prison authorities partially filled the northern side of this quarry in the late 1990s. The cairn of stones called isisivane at the entrance to the Quarry was created by ex-political prisoners, led by Mandela, during their reunion in 1995. It commemorates the daily life and hard work endured by political prisoners.