Noida, Nov. 4 -- Two brothers died after allegedly falling into a 7-foot-deep septic tank they were cleaning at their home in Noida's Sector 63 Chotpur Colony on Monday morning, police said. A neighbour who jumped in to rescue them had to retreat because of the thick toxic gases inside. He is reported to be stable. The bodies of the brothers were recovered after officials broke open the reinforced cement concrete (RCC) tank using grinder machines, police added. Police said the incident occurred when one of the brothers, 45-year-old Chandrabhan, slipped and fell into the tank while standing beside it. He and his younger brother, Raju, 26, had been attempting to clean the choked tank themselves, without any protective gear. The two worked as carpenters at a furniture shop in Khoda, Ghaziabad. "Around 9am on Monday, the sewage line in their house got choked, and Chandrabhan and Raju decided to fix it on their own without calling in expert help. Chandrabhan partially opened the septic tank's manhole after breaking the cement and brick cladding," said an officer, requesting anonymity. "Chandrabhan was standing next to the partially open manhole on the ground floor while Raju was on the upper floor inspecting the sewage lines. Chandrabhan accidentally slipped and fell into the tank, which contained about two feet of water. Hearing his family's screams, Raju rushed downstairs and jumped in to save brother without safety precautions," the officer said. "But Raju too quickly lost consciousness due to the toxic fumes and got trapped inside... Police were informed around 9.40am," said Avdhesh Pratap Singh, SHO, Sector 63. "Using three to four grinder machines, the RCC tank was broken open, and the brothers were pulled out after nearly an hour of effort," SHO Singh said. They were rushed to a nearby private hospital, but doctors there referred them to a higher facility, where both were declared dead. The deceased are survived by their mother, younger brother's wife, and his four children, including the youngest eight-month-old "The tank was about six to seven feet deep and had stagnant water inside. The post-mortem has been conducted, and further probe is on," the SHO added. No case has been registered so far....