NEW DELHI, INDIA - AUGUST 20: Delhi Police officers investigating the sewer where Rishi Pal was dead and left three people unconscious due to sewer cleaning at Lok Nayak Jai Prakash Narayan Hospital, on August 20, 2017 in New Delhi, India. Rishi Pal, 40, along with Bishan, 30, Kiran Pal, 25, and Sumit, 30, fell unconscious after inhaling poisonous gases while cleaning the sewer. (Photo by Sonu Mehta/Hindustan Times )
