Would Bitcoin survive through offline solutions like mesh networks and satellites, or would it completely halt?
It would
survive, because it was the internet that was shut down, not the Bitcoin architecture itself, so Bitcoin would remain there and would not be affected. However, all transactions would likely be pending, because broadcasting those transactions to the network requires the internet, and since the internet is unavailable, all transactions would be held until internet access is restored. But you know that a case like this would cause an uproar worldwide, because the internet is so crucial to modern life, and I think it wouldn't just be Bitcoin that would be affected, but all sectors globally.