Possibility of being exposed to hydrogen sulfide during sewer construction A worker died at the live gate

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1. Possibility of being exposed to hydrogen sulfide during the construction of the sewer pipe One worker died at the live gate
2. Did hydrogen sulfide occur during construction? 1 worker died, 1 rescued (05/20/11) ANNnewsCH
3. Gas generation at the sewage construction site One man died (Yab Yamaguchi Asahi Broadcasting) Yahoo! News
4. Sewer Construction Accident Killed One Person, Yamaguchi and Iwakuni (May 11, 2020) | BIGLOBE News BIGLOBE News
5. Did hydrogen sulfide occur at the sewer site? A worker died at the living door
6. See all articles in Google News