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Technically, the internet has multiple layers and only the lowest ones are dependent on the physical network implementation—you could totally send network packets via messenger pigeon and still have it be a valid part of the internet. But I think the scenario you most likely have in mind is one where we don’t have wired or wireless networks, and/or we don’t have computers to function as endpoints. And the goal is to have some kind of long-distance user-to-user exchange of non-sensory data (i.e., not just telephones or broadcast media.)
One solution might be to shine lasers on a distant object, like the moon: everyone has a designated signaling target on the object, and you could send them data by shining a pattern of light on their target.
The moon is 1.26 light seconds away. That's a 2520 ms ping.
OSI Model gang represent!
Also, I'm sure you already know this, but RFC 1149 (IP over Avian Carriers) was actually tested by Bergen Linux User Group. They successfully sent packets several kilometers.