One of four workers killed in an explosion at a waste water treatment works was thrown 150 metres (500 feet) into a lake, it is claimed.
Sniffer dogs were brought in to search for bodies after a chemical tank exploded like a "bomb" at a Wessex Water site in Avonmouth,near Bristol.
Heartbroken colleagues have been paying tribute online to the four men who died, and mourners have been leaving flowers and cards at a memorial at the site as the investigation into the cause continues.
Three employees of Wessex Water and a contractor were working on top of the chemical tank at a water recycling centre when the blast occurred just after 11am on Thursday.
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