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The 24-year-old staff member was standing near the blast and suffered severe burns to his arms, face and chest and was left in a coma.
He has since died from his injuries.
The cause of the explosion is believed to be a cleaning agent that was poured over the floor which ignited when a dishwasher was turned on.
“A flammable liquid was laid down to clean the bar and run the length of the bar so the fire explosion was around about the length of the bar, which was a significant fire,” Fire and Rescue NSW Superintendent Andrew Shurety said.
A report will be prepared for the Coroner and SafeWork NSW is investigating the incident.