'I volunteered on a migrant rescue ship'
Rough seas, winter storms and long, dark nights make this time of year the most dangerous for migrants attempting to reach Europe from North Africa.
But many people are still attempting the perilous crossing, often in small dinghies.
Last week, 100 people drowned after their boat sank off the coast of Libya.
BBC producer Alva White was on secondment to Medecins Sans Frontieres (MSF), and filmed her experiences for us. This is her story of the crisis.