New Delhi, Feb. 8 -- A sub-contractor was on Saturday arrested in connection with the death of a 25-year-old bank telecaller who fell into an unsecured Delhi Jal Board (DJB) pit, investigators said, as it emerged that the man's body lay there for nearly eight hours and several people aware of the accident chose not to inform the police or authorities. The sub-contractor, Rajesh Kumar Prajapati, was one of at least five people aware that Kamal Dhyani's motorcycle had plunged into the 4.5-metre-deep Janakpuri pit but concealed this knowledge from the police. The 47-year-old man has been booked for culpable homicide not amounting to murder. Investigators are now trying to ascertain if Dhyani died soon after falling in, around 12.15am on Friday, or hours later, as people walked past on the busy street near Andhra School in Janakpuri. Police pieced together a grim sequence of events as the five tried hard to keep the incident under wraps from police - from the moment Dhyani fell in, till a woman passerby dialled the emergency hotline at 8.03am - a delay that potentially scuttled any chance of saving the HDFC Bank employee. Meanwhile, a preliminary Delhi Jal Board (DJB) inquiry underlined a raft of lapses, including inadequate public safety arrangements and negligence by the contractors and supervising engineers. It concluded that the site was unsecured and unattended - arrangements the people who withheld information from the police were responsible for. Dhyani finished his shift at the Rohini call centre and got on his TVS Apache motorcycle for the roughly 20-km commute back home to Kailashpuri in Palam Colony. Officers combed through CCTV camera footage and found that, around 12.15am, a black car stopped on the carriageway opposite. The passerby, Sagarpur resident Vipin Singh, was driving home from a wedding when he saw the motorcyclist fall into the pit, said police. "Singh stopped the car near the residential colony and informed the security guard at the main gate of a residential colony about the incident. The guard alerted Yogesh, a labourer working on the pit and staying in a tent 10-feet away," said deputy commissioner of police (west) Sharad Bhaskar. "Yogesh walked to the pit and saw a motorcycle inside with its headlight on. A human being lay beside it," he added. At 12.22am, Yogesh called his employer, Prajapati, who arrived at the spot around 20 minutes later in his car from his house in Tri Nagar around 12km away. "Prajapati saw the victim and his motorcycle lying inside the pit. Neither he nor Yogesh informed police," added Bhaskar. The sub-contractor then called and informed his boss, the contractor, Himanshu Gupta. In fact, Gupta, Prajapati and a few others, who Delhi Police declined to identify, had a conference call, all as Dhyani's body lay in the pit. Prajapati turned away at 1.45am and returned home. Yogesh fled the spot soon after. "We have sent a team to Yogesh's village in Etawah, Uttar Pradesh, to nab him. Gupta is also out of Delhi and another team has been dispatched to nab him," said joint commissioner of police (western range) Jatin Narwal. Police did not reveal where Gupta was. According to the first information report (FIR), a copy of which is with HT, the victim was admitted to the hospital "unconscious and unresponsive". He was declared dead on arrival. It also says the pit was dug by DJB and left open without any safety arrangements to alert road users. "There was no barricading, no warning sign or security guard deployed at the site despite the pit being dug in the middle of the road," said the FIR....