The burglars broke into their latest store near Paris and drilled a hole in the "pneumatic tube" that siphons money from the checkout to the strong-room.
They then sucked rolls of cash totalling £60,000 from the safe without even having to break its lock.
Police said the gang — dubbed the Vacuum Burglars — always raid Monoprix supermarkets and have hit 15 of the stores branches around Paris in the past four years.
A spokesman added: "They spotted a weakness in the company's security system and have been exploiting it ever since."
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