大象传媒

In April 2016 a boat carrying more than 500 people sank in the Mediterranean. Fewer than one in ten of those on board survived. The passengers were migrants, travelling from North Africa to Italy. Survivors spoke of a horrendously overcrowded ship, unfit for its human cargo. But other details of the journey remained unclear, including where the passengers set off from, and who organised their deadly journey. John Sweeney investigates.