- Director Gianfranco Rosi turns his lens to the plight of migrants trying to reach Italian Island
- He calls documentary "a testimony of one of the biggest crises that Europe is facing"
- "Fire at Sea" won top prize last month at Berlin Film Festival
(CNN)We've all seen the images of boats carrying hundreds of refugees, many of whom don't make it through the perilous crossing into Europe. It's a reality that's shaking Europe to the core.