Calcutta, Aug. 20 :    Calcutta, Aug. 20:  The SSKM Hospital authorities on Monday sent an SOS to the Calcutta Municipal Corporation (CMC) as the chest, cancer and dialysis units of the hospital reeled under acute water crisis. Executive engineer and assistant engineer of the Public Works Department (PWD), who look after SSKM Hospital, told surgeon superintendent Debdaipayan Chattopadhyay that water supply to the hospital's main building, as well as the Ronald Ross building, Woodburn ward and chest and cancer buildings, could not be improved until the CMC increased its supply to the hospital. The engineers said the hospital's main underground reservoir was located in the dialysis unit and it was not receiving enough water from the CMC through the ferrule connection. Other buildings were being provided with water from the reservoir. Mayor Subrata Mukherjee has asked the water supply department to take immediate steps. Chief engineer, water supply, Dibyendu Roychaudhury said: 'We have repeatedly urged the PWD to take bulk supply by the meter system. The civic authorities will then be able to meet all their requirements. But neither the superintendent nor the PWD has responded to the proposal.' Roychaudhury said the water supply department has already increased the size of the ferrule, but even the largest ferrule will fail to meet the needs of the entire hospital. Beside the CMC supply, the hospital has its own deep tubewell. A few months ago, the executive engineer had raised a proposal to sink another deep tubewell to augment supply. The scheme was not implemented.