On a blank sheet of paper, Marcos sketches the plan of the Kurdish prison where he spent 95 days in captivity.
"Just picture more than a hundred people inside a 65-square-meter [700 square foot] cell! We had to lie on our sides against each other to sleep, or even remain seated," the 47-year-old Spaniard told DW from his home in Rabanales, a village in northwestern Spain.
Marcos, whose codename was "Dr. Delil," was one of three Spaniards imprisoned last August in the Irbil General Security Directorate, a huge compound in the capital of Iraqi Kurdistan (KRG). He had served as a paramedic in the Sinjar Resistance Units (YBS), a Yazidi armed group set up to protect this minority against radical Islamists, namely the "Islamic State" (IS) group.