The trio had been cleaning the (many) windows on the Wells Fargo Plaza building in Houston, when the accident happened.
When their device broke it meant the platform they were standing on fell, snapped and left the men clinging on.
They were then left hanging by their harnesses for over two hours while rescuers removed a window from above them and pulled them to safety.
When they were finally yanked in from their precarious position one of the rescuers said: "you missed a bit".