![Interconnecting Tunnel Photo of Interconnecting tunnel discovered in Nogales, Arizona](/sites/default/files/photo/5.%20Nogales%2C%20AZ-JD.jpg)
A rudimentary, hand-dug tunnel connected the diggers to the Nogales drainage system through a "break-in" which can be seen in this photograph.
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A rudimentary, hand-dug tunnel connected the diggers to the Nogales drainage system through a "break-in" which can be seen in this photograph.