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Does Tor Authority servers have fallback?

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Does Tor have fallback?

The answer here states that in case of blocking all the Authority servers new clients would be sad.

I conducted an experiment, where I blocked all the Authority servers and a new, never used before client still bootstrapped and established a Tor circuit. Although it took 30 minutes to do so.

So I'd like to know if Tor has fallback directory servers? Or somehow it must get the first IP to connect to if all the Authority servers are blocked. And where does that IP come from?