The incident came to light in the morning today when the employees entered into the branch of State Bank of Bikaner and Jaipur (SBBJ) and found the opening of the tunnel inside the bank, police said.
It was dug from outside the bank, they added.
The thieves entered into the branch but could not open the safe despite efforts, so the cash remained safe, the police said, adding that the efforts were being made to identify them.