Hand Tools Before there were explosives and tunnel-digging machines, workers used hand tools to carve tunnels. First used in a tunnel around 2000 B.C., to mine copper, gold, and salt from mountains in Belgium, France, and Portugal

Did you know?
In the Middle Ages, medieval armies launched sneak attacks on enemy castles by digging tunnels through sandy soil under moats using crude hand tools. The men dug tunnels not only to gain entrance to a castle, but to destabilize and topple it. They supported their tunnels with timbers, which they then burned to collapse the tunnel -- and hopefully the castle as well.

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