Guantánamo Bay Explained: The Costs, the Captives and Why It’s Still Open NYT | Top Stories By: Carol Rosenberg 10 January 2025 at 02:56 Just 15 men remain at the prison, down from hundreds when it opened 23 years ago. But the costly operation could go on for years. © Doug Mills/The New York TimesA prisoner at Guantánamo in 2019. Fifteen inmates remain at the military base.