Mandatory Palestine was a destination for 18,000 Jews escaping the Nazi regime through the Balkans between 1937 and 1944. This was organized by the Zionist movement. There were more than 16,000 Jews who later were bound for Palestine on boats from the Romanian and Bulgarian ports on the Black Sea and often through Turkey for refueling. One ship, MV "Struma", was sunk, presumably accidentally, by a Soviet submarine, in what is referred to as the "Struma" disaster.