What makes tunnels so difficult to detect?
In: Technology
That’s an apples to oranges comparison. Same as “we can go to the moon but we can’t explore the depths of the ocean”. In both my example and your question, they’re two very different things that require two very different types of technology.
Consider what sort of device or technique you’d use to detect tunnels? The only things I can think of are out of science fiction movies.
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