A representative from the department's Traffic Infrastructure Maintenance Unit said Sunday that a 400-mm-diameter pipeline (D400), operated by the Hanoi Clean Water Company, had been leaking.
The leaking water gradually eroded layers of crushed stone and fine gravel beneath the road, eventually causing the surface to collapse.
The water company had suspected a leak for nearly two weeks but could not pinpoint its exact location until the sinkhole appeared, according to the representative.
Repair crews promptly sealed the leak, filled the hole, and resurfaced the affected road section.
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A sinkhole on Truong Chinh Street in Hanoi is refilled on July 27, 2025. Photo by Hanoi Traffic Infrastructure Maintenance Unit |
At around 9:00 p.m. on Saturday, a man riding a Honda SH motorbike along Truong Chinh Street approached the intersection with Ton That Tung Street when the front wheel of his bike suddenly dropped into the sinkhole, causing him to fall.
He sustained minor scratches.
The motorbike was retrieved more than an hour later.
Authorities measured the sinkhole at about one meter deep and one meter wide, describing it as frog-mouth-shaped, with no water inside at the time of the incident.
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A motorbike is swallowed by a sinkhole on Truong Chinh Street of Hanoi, July 26, 2025. Photo by VnExpress/Viet An |