New Delhi: State-run engineering major BHEL on Monday said it is still grappling with uncertainties with regard to resumption of normal business operations as rising coronavirus infection cases have led to labour shortage and supply chain disruptions.The country went into a complete lockdown in March-end to check the spread of coronavirus and the government started giving relaxations in lockdown guidelines towards the April-end by gradually opening up economic activities.However, with COVID-19 cases still surging in various parts of the country, BHEL struggled to get back to its normal operational capacity.Meanwhile, India's COVID-19 tally has crossed the 18-lakh mark and the death toll has climbed to 38,135, official data showed on Monday..