The stretch of the Mediterranean Sea separating Libya from southern Italy has become a death trap for some of the world’s most vulnerable people. Although refugee and migrant arrivals across all of Europe are down compared to last year ― as of Oct. 9, 316,331 migrants and refugees had entered Europe by sea this year, compared to 520,000 by that date in 2015 ― more people have already died, according to the International Organization for Migration.