'For 15 years, I didn't see the sun rise or go down'

Mohamedou Ould Slahi was imprisoned without charge at Guantanamo Bay for nearly 15 years.
Arrested in 2001 and transferred through various prisons before arriving at Guantanamo, Slahi endured years of torture and harsh interrogation under the US government's post-9/11 counterterrorism efforts. He was detained on suspicion of terrorism, but no charges were ever filed against him. The World's Shirin Jaafari spoke with Slahi and brings us his story.