One of the big selling points of drones is that they can get to areas that aren't exactly safe or accessible by humans. That's why watching quadrocopters assembling a rope bridge that's sturdy enough for a person to walk across is so damned awesome -- it immediately calls to mind a real-world use scenario that probably all of us can relate to. The video below was filmed at RTH Zurich Flying Machine Arena in Switzerland, and, according to the YouTube description, aside from the scaffolding on either side of the bridge, the structure is "entirely realized by flying machines." Every knot and braid in the 7.4 meter (just over 24 feet) bridge was tied by the UAVs using Dyneema rope. As Robohub tells it, the material has a low weight-to-strength ratio that makes it pretty great for aerial construction uses.