Quote:
Originally Posted by Bladewire
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Hundreds of these tunnels here. A wall is a waste of time & money.
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Then why were these built?
As for the tunnel digging theory.
Motion detectors to detect tunnel builders.
Because most of you are too busy scraping a living you don't know that tunnel diggers have been a problem for centuries and the defenders had to have ways of detecting them.
![](http://orig12.deviantart.net/fa33/f/2013/020/3/5/a_bucket_full_of_water_by_lightningball-d5s3fa8.jpg)