The rupee on Monday dived 18 paise to close at a five-week low of 75.07 against the US dollar as fresh worries over new coronavirus variant weighed on already weak investor sentiment. At the interbank foreign exchange market, the local currency opened at 74.84 and witnessed an intra-day high of 74.82 and a low of 75.16 against the US dollar in a highly volatile trading session. The local unit finally settled at 75.07 a dollar, down 18 paise over its previous close.The Indian rupee depreciated for the third straight session against the US dollar weighed down by greenback demand from oil companies and fresh long dollar positions amid concerns over a new coronavirus variant, said Sriram Iyer, Senior Research Analyst at Reliance Securities.