Mohamedou Ould Slahi was imprisoned without charge at Guantánamo Bay for nearly 15 years. Ould Slahi speaks to Business Insider about the prison layout, the facilities, the food and what yard time was like. He reveals what torture methods were, and how guards interacted with detained persons. Arrested in 2001 and transferred through various prisons before arriving at Guantánamo, Slahi endured years of torture and harsh interrogation under the U.S. government's post-9/11 counterterrorism efforts. He was detained on suspicion of terrorism, but no charges were ever filed against him. His memoir Guantánamo Diary was released in 2015. His memoir was adapted into a feature film, "The Mauritanian," featuring Jodie Foster and Tahar Rahim. Slahi now writes and speaks about human rights, justice, and reconciliation. For more: https://www.instagram.com/mohamedououldsalahi/ https://www.linkedin.com/in/mohamedou-ould-slahi-houbeini-4834a1136/