With support from the Fondation Carmignac, after winning the Carmignac Photojournalism Award in November 2015, Contreras brought to light “"Libya: a human marketplace"”, A report that narrates his thoughts and observations as he travelled through the complex tribal society of post-Gaddafi Libya from February to June 2016, photographing the brutal reality of human trafficking. It was the dawn of a long-term project documenting a modern-day slavery issue framed on the trafficking of human beings along the network that stretches from the Niger border with Libya, to the main rescue zone in the Mediterranean Sea, off the Libyan shoreline.