Three workers were killed when a central Tehran sewer tunnel collapsed late Saturday, suffocating them, reported Iran News Agency (IRNA).
The agency said the bodies of two engineers, aged 28 and 30, had been recovered Sunday, but it would take several hours to bring out the third, of an Afghan worker.
The three had gone into the tunnel to find out why another part of the system had fallen in, IRNA said.
Tehran City Hall and a private company have been constructing the first proper underground sewerage network for the 10-million-inhabitant city - Albawaba.com
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