At least 20 illegal migrants have drowned when a boat taking them towards the European Union sank in the Black Sea just off Istanbul. Six people were pulled alive from the freezing waters. Another sixteen are unaccounted for.. Al Jazeera's Bernard Smith reports from Istanbul. Subscribe to our channel http://bit.ly/AJSubscribe Follow us on Twitter https://twitter.com/AJEnglish Find us on Facebook https://www.facebook.com/aljazeera Check our website: http://www.aljazeera.com/