alt Hacker NewsTunnels through which dogs could carry packages or messages no matter what the weather was like and without fear of getting lost or interfered with on the way?
The chambers at the ends could have been where the dogs slept and were fed.
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nkrisc • yesterday at 10:20 PM
And then returned the message back to the single entrance?
They have only one access point, per the OP, so they don't provide transit anywhere.