text: 22 September 2015 Last updated at 14:14 BST
  The project was the result of a joint study by two researchers - one specialising in robotics, the other architecture - at ETH Zurich University's Institute for Dynamic Systems and Control and Gramazio Kohler Research.
  They hope the technology could eventually be used to save lives.
target: Quadcopter drones have been programmed to build a rope bridge capable of supporting the weight of a human.