Amid a lack of legal routes, migrants and refugees are risking their lives to reach the U.K.

At least four people died when their boat sank in the English Channel this week, a route taken by tens of thousands of migrants and refugees trying to reach the U.K. Matt Galloway discusses these perilous journeys and the lack of legal routes for some nationalities, with Nando Sigona, chair of international migration and forced displacement at the University of Birmingham; and Christa Rottensteiner, chief of mission with the International Organization for Migration in the U.K., a United Nations agency.