A 30-year-old man, working on contract with Jusco's health and sanitation wing, died of asphyxiation in Jamshedpur on Tuesday morning after his supervisor allegedly sent him down a 20-feet-deep sewer manhole on the company's premises to fetch a gas measurement equipment that the latter accidentally dropped.

Another contractual worker, Aakash Karua (31), who had followed Ganesh into the manhole also suffered methane poisoning, but was rescued on time. He is being treated at Tata Main Hospital (TMH), where doctors said his condition was stable.

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