A boat from Libya carrying 86 migrants sank in the Mediterranean and left only three survivors, authorities said Thursday, after an airstrike on a detention center near the Libyan capital killed dozens of others. The twin tragedies illustrate the almost unthinkable choice facing those who have reached the North Africa coast while seeking a better life in Europe: Risk a hazardous sea voyage in a flimsy, rubber-sided boat, or face being crammed into a detention center, where some of the migrants say they have been forced to assemble weapons for someone else's war. "I fled from the war, to come to this hell of Libya," said one teenager from sub-Saharan Africa who suffered minor injuries in Tuesday night's airstrike near Tripoli.