Police said the small tunnel was dug on Saturday night itself.The jewellery store closed its doors at around 8 pm on Saturday. "We found that the miscreants drilled a giant hole from the drain to the jewellery store. Police sources said this was the first time that thieves used such a modus operandi for robbery in the state. The market was completely empty and darK," Pramod Mahakud, a local shopkeeper said.Jewellery store owner, Mahesh Santada, said he was in shock. "We suspect the thieves took advantage of heavy rain in the night..