GDI Supermax

The GDI Supermax is the name given to a high security facility maintained by the Global Defense Initiative by the time of the Fourth Tiberium War and is located in the Artic Circle. After the capture of Commander Parker following his insurrection alongside with Colonel Louise James, he was imprisoned within the Supermax facility. Parker was sprung from detention by a special agent and informed him that a Global Stratospheric Transport was docked at the facility but remained in lockdown by the use of tractor beams. Following Commander Parker is a team of loyalist soldiers who helped secure a landing site for a Crawler and together they managed to escape in the GST.

Source

 * Tiberian Twilight Lockdown