
Hobby tunneling
Form of recreation involving constructive excavation

Form of recreation involving constructive excavation
Hobby tunneling is tunnel construction as a pastime. Usually, hobby tunnelers dig their tunnels by hand, using little equipment, and some can spend years or even decades to achieve any degree of completion. In some cases tunnels have been dug secretly, and are only discovered by chance.
Read on Wikipedia · Image Carol M. Highsmith, Public domain
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