James Bond lives on as the 'dead drop' sees a tech resurgence in Hong Kong

March 11, 2015

During the golden age of spying, the dead drop was an invaluable tool: a letter, picture or bit of microfilm would be deposited in a secret hiding place—often a hallowed out rock, or false bit of brick—for another spy to pick up.  Nowadays, USB keys embedded in concrete walls with the tip sticking out are used to share files offline, in a public space.