This market will resolve to "Yes" if at least one inmate is officially held at Alcatraz Federal Penitentiary on Alcatraz Island by December 31, 2026, 11:59 PM ET. Otherwise, this market will resolve to "No". The inmate must be detained by the U.S. federal government as part of a formal correctional or detention program. Temporary holds of less than 24 hours or symbolic events will not count. The resolution source will be a consensus of credible reporting.