The four-metre tunnel pierced a cement wall and went directly to the bank vault, Napoli Today reported on Tuesday.
But despite what appeared to be a sophisticated feat, the would-be bank robbers made the fatal error of digging their tunnel just a few steps away from a police station.
Police spotted the unusual activity and alerted the bank director, who secured the area, Napoli Today said.
The discovery came just a day after Naples police uncovered another tunnel in the city, leading to a building society.
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