---
title: "Hydrogen Explosion"
description: "CBRNe World provides those tasked with defending against CBRN and IED threats with the essential practical, scientific and political information. Access the current and previous issues of the magazine by registering as a member."
url: "https://cbrneworld.com/threats-news/europe/hydrogen-explosion"
date: "2026-07-30T21:07:35+00:00"
language: "en-GB"
---

#  Hydrogen Explosion

 Written on 22 December 2025.

Four people were injured, three of them critically, in a hydrogen explosion at the Elkem Silicones site in Saint-Fons, south of Lyon, on December 22nd. The blast occurred in an experimental workshop at the silicone materials production facility, a high-threshold Seveso-classified site (an industrial sites handling dangerous substances above specific thresholds). The explosion ignited a fire in a 600-square-metre building, which was brought under control by early evening. Around 100 firefighters and 30 emergency vehicles were deployed to tackle the incident, authorities issued a shelter indoors notice, affecting over 100,000 people, and a 1-kilometre security perimeter was established around the facility. The plant has experienced previous incidents, in June 2016, a worker was killed when silicone drums caught fire in a 2,500-square-metre warehouse, with 600 square metres of the building destroyed.

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