A water firm has pleaded guilty to health and safety charges after an explosion at one of its sites killed four workers, including a teenage apprentice.
Luke Wheaton, 16, Ray White, 57, Brian Vickery, 63, and Mike James, 64, died in the blast in a silo at Wessex Water's treatment site in Avonmouth, Bristol, in December 2020.
An Avon and Somerset Police investigation into manslaughter was dropped in 2024 but the Health and Safety Executive (HSE) undertook its own investigation to determine if criminal offences had been committed under health and safety laws.
At a hearing at Bristol Magistrates' Court earlier, Wessex Water pleaded guilty to three charges under the Health and Safety at Work Act.
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The charges were failing to ensure the health, safety and welfare of its employees, failing to ensure the health, safety and welfare of someone other than an employee and failing to comply with a health and safety notice.
The explosion took place in a silo containing biosolids – recycled organic matter used by farmers as agricultural fertiliser.
Judge Lynn Matthews referred the "complex and sensitive" case to Bristol Crown Court where the next hearing was due to take place on 8 January.
The four workers who died were on the roof of the silo when the explosion happened.
It is understood James was a contractor working at the site, while Vickery and White were employees of Wessex Water and Wheaton an apprentice at the firm.
A BBC investigation revealed safety reports had noted serious concerns about conditions in parts of the water treatment plant five years before the explosion.
The documents highlighted a "perfect explosive mixture", "serious risk to personnel" and a smell of gas so strong the authors claimed they could not stay in the area to complete their report.
Wessex Water said it had "robust process controls on site" and the matters identified by the reports had been resolved.
The company said the reports related to a different part of the site – not the part where the blast happened.
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