Human Rights Watch has published their 643-page “World Report” for 2018. In the report it details the events that shaped Libya’s politics, conflict, immigration, judiciary and human rights concerns for 2017. The report explores Libya’s migrant and asylum situation, describing:
Most of the more than 200,000 migrants and asylum seekers who reached Europe by sea in 2017 departed in boats from Libya. Migrants and asylum seekers who ended up in detention in Libya faced beatings, extortion, sexual violence, and forced labor in unofficial and quasi state-run detention centers, at the hands of guards, militias, and smugglers. Coast guard forces also beat migrants they intercepted at sea and forced them back to detention centers with inhumane conditions. Between January and November, 2,772 migrants died during perilous boat journeys in the central Mediterranean Sea, most having departed from the Libyan shore.
You can access the chapter devoted solely to Libya here and the full report here.