It depends how you define "going down." Here's an old screenshot of mine of when Google Search failed spectacularly by marking every single link as malicious an

It depends how you define "going down." Here's an old screenshot of mine of when Google Search failed spectacularly by marking every single link as malicious and therefore not taking the user to that site when you click the link [1] [2]. Perhaps that might qualify as going down, although clearly it didn't go down at the network level. It remained broken (in that way) for quite some time (maybe longer than an hour.) But, happening in 2009, I can't accurately recall. Here is another scenario when Google Search failed to successfully serve my query [3]. And an early time when YouTube went down [4]. [1] https://i.imgur.com/X05BCpI.png https://i.imgur.com/X05BCpI.png [2] https://i.imgur.com/CaDh1Y6.png https://i.imgur.com/CaDh1Y6.png [3] https://i.imgur.com/VZI4Yew.png https://i.imgur.com/VZI4Yew.png [4] https://i.imgur.com/bPTp4bg.png https://i.imgur.com/bPTp4bg.png