Twenty-two years ago, following the September 11 attacks, the United States government opened a military detention camp for suspected terrorists on the coast of Guantánamo Bay, Cuba. Operating outside the constraints of U.S. law, detainees could be held indefinitely in “Guantánamo,” as the prison tends to be called, without being charged. Instead of prisoners of war, which are protected by the Geneva Conventions, detainees were classified as “unlawful enemy combatants.” Through these loopholes, prisoners could be subjected to abuse, torture, and prolonged imprisonment. Some were only released after 14 years. Thirty still remain in Guantánamo. For the fourth season of Serial, hosts Sarah Koenig and Dana Chivvis speak with guards, interrogators, interpreters, commanders, and even former prisoners to tell the human history of the world’s most controversial prison. —Paulina Prosnitz

The first two episodes of Serial Season 4: Guantánamo launch on March 28, with episodes released weekly after that