Immigrants crossing the Strait of Gibraltar on a surfboard

STRAIT OF GIBRALTAR, SPAIN - NOVEMBER 20: Three would-be immigrants from Morocco paddle in rough seas on a windsurf board trying to cross the Strait of Gibraltar moments before being resqued by a passing ferry on November 20, 2007 in the Strait of Gibraltar, Spain. The migrants where paddling the Strait of Gibraltar from Morrocco towards Spain pulling their belongings behind them in a tyre. Authorities fear that many of the thousands of Africans who make the dangerous journey to Spain each year die, but there is no way of knowing exactly how many. (Photo by Alberto Rosado/Getty Images)