Could Bitcoin theoretically survive under manual mining only?

[aso118]

Wouldn't one guy with a PC which has survived, be easily able to execute a 51% attack?
The high hashing power which secures the blockchain is what makes Bitcoin what it is today.

[bob123]

At this stage i dont think bitcoin could survice in a nuclear war with the help of manual hashing 
Other problems are way bigger.

[apoorvlathey]

Wouldn't one guy with a PC which has survived, be easily able to execute a 51% attack?
The high hashing power which secures the blockchain is what makes Bitcoin what it is today.

Bitcoin needs internet to work. As most of the computers, and therefore their interconnection i.e the internet, would get destroyed then it would be of no use if some people with PCs survive. If the servers of Bitcoin or other cryptocurrencies would not survive then their value would become zero !

[Snorek]

In case of global catastrophe. Mass internet fail due to  cosmic rays, emp, nuclear war other problems. BTC will the least of our problems.
Lets be realistic here. Bitcoin is digital currency, manual mining was just showcase that something like this potentially can be conducted.
For bitcoin to work we need fully computerized mining, network with nodes.