Your assignment: Design a post-apocalyptic communication system

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In a post-apocalyptic scenario featuring underground cities in the US housing one million survivors, a communication system is needed to connect these cities and potentially link to Europe and Asia via undersea cables. The cities have ample energy resources, but the lack of infrastructure between them raises concerns about the practicality of long-distance communication. Suggestions for establishing this communication system include utilizing existing technologies such as ham radio, satellite communications, and even repurposing old USGS equipment for those at greater distances. The concept of broadcasting Morse code using seismic methods has also been proposed, leveraging the remaining nuclear arsenal for communication purposes. Overall, the focus is on creating a resilient and effective communication network despite the challenges posed by the environment and infrastructure limitations.
CCWilson
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I'm a programmer but weak on hardware so I'd appreciate your help. In a novel I'm writing there are about one hundred underground cities housing one million people in the US; the rest of our population is dead. Somewhat smaller percentage of survivors in Europe and Asia. We have several years warning and want to establish a communication system - internet and television - for the survivors, including - if possible - communication with Europe and Asia via undersea cables. The cities have plenty of energy available but there will be none between cities, so I wonder if the distances between nodes will make it impractical.

Can anyone help me with this? Thanks.
 
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Your assignment: Design a post-apocalyptic communication system
Sounds like the original design parameter for the internet... so what's wrong with that?
 


This but with really long strings
 
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Ham Radio?
 
Satellite comms?
 
they should use the remaining us nuclear arsenal to broadcast morsecode seismically.

they can use old USGS equipment if they're a little further away or hard of hearing.
 

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