By EWEN MACASKILL and GABRIEL DANCE Produced by FEILDING CAGE and GREG CHEN Published on November 1, 2013 When Edward Snowden met journalists in his cramped room in Hong Kong's Mira hotel in June, his mission was ambitious. Amid the clutter of laundry, meal trays and his four laptops, he wanted to start a debate about mass surveillance. He succeeded beyond anything the journalists or Snowden himse