Ron Wyman: Migrants' route across the Sahara often starts in Agadez @ BBC World Service. Interview by Julian Marshall

It's not just the Mediterranean that has - in the words of the prime minister of Malta - become a "cemetery" for so many African migrants who have drowned in recent weeks seeking a new life in Europe. The sands of the Sahara are also the last resting place for scores of migrants making their way from west Africa to the shores of north Africa. Nearly ninety people - believed to be migrant workers - were this week discovered in the Sahara desert in the north of Niger. Many migrants travel from countries across the region to the Nigerien city of Agadez where they pay smugglers to ferry them across the Sahara in often rickety trucks. Newshour's Julian Marshall spoke to the independent film maker Ron Wyman, who knows the region well and has made a film in Agadez.