72 Hour Urban Action, the world's first real-time architecture competition, will give selected teams only three days and three nights to design and build interventions in public space in response to local needs, social challenges, and the sites and missions offered. With an extreme deadline, a tight budget and limited space to rapidly leave a lasting impact on the city's urban fabric, participating teams will be battling the clock, the restrictive conditions, and each other to dream and realize projects. The competition will take place July 25-28 in Derry-Londonderry, in northern Ireland. For more information, and to apply, please visit here. More images after the break.