But what is Red Bull Flugtag, anyway?
Named after the German word for “flying day”, it is a competition organised by the energy drink brand. Since its successful inception in 1992, the event has been held every year in over 35 cities worldwide.
It challenges competing teams to design, build and fly homemade human-powered flying machines.
But because they will ultimately end up in the water, the craft must be unsinkable and constructed entirely of environmentally-friendly materials.
It’s a contest that’s fun for spectators, too. Red Bull Flugtag events usually attract thousands of people who come out to watch the action unfold.