The video linked in the parent post explains that the Manhattan eruv has never been down. A rabbi goes all around on Thursday and repairs are made on Friday if

The video linked in the parent post explains that the Manhattan eruv has never been down. A rabbi goes all around on Thursday and repairs are made on Friday if needed. Even when the Thanksgiving parade knocked down some wires or after hurricane Sandy, they managed to get it repaired in time for Shabbat: https://www.youtube.com/watch?v=ccfDo7yTHr8 https://www.youtube.com/watch?v=ccfDo7yTHr8