Dehradun, Aug. 14 -- Six workers were killed and 14 others injured late on Thursday after a landslide and heavy water seepage triggered a partial collapse inside an under-construction Tehri Hydro Development Corporation Limited's project site in Uttarakhand's Chamoli district. Two people are still trapped inside the tunnel. According to State Emergency Operations Centre officials, the incident took place around 7 pm at the tunnel, constructed by the Hindustan Construction Company in Pipalkoti. "Water, accompanied by a landslide, suddenly began seeping into the tunnel, trapping 22 workers," said an official. A large-scale multi-agency rescue operation was launched immediately. An official aware of the matter said, by 11 pm, 20 workers were rescued from the tunnel. Six of them were declared dead, while 14 others were injured and shifted for medical treatment, the official added. The rescue operation is being undertaken by 57 personnel from the National Disaster Response Force (NDRF), 42 from the State Disaster Response Force (SDRF), 21 from the Indo-Tibetan Border Police (ITBP), 22 from local police stations and outposts, nine fire service personnel and four personnel from the District Disaster Response Force (DDRF). Senior officials are at the site and supervising the relief and rescue operation. HCC machinery and specialised equipment were also deployed to clear debris and assist the rescue teams. The injured workers were initially taken to the district hospital in Gopeshwar for treatment. The administration also placed Base Hospital Srinagar and AIIMS Rishikesh on alert to deal with any critically injured workers. Officials said the rescue and relief operation was continuing and the administration was monitoring the situation closely....