Investigations are continuing into a fire at BAE Systems in Barrow last month.
Flames and smoke were seen emerging from the Devonshire Dock Hall, the complex where the UK’s new multi-billion-pound Dreadnought and Astute submarines are being built, in the early hours of October 30.
Fire crews from Lancashire joined colleagues from Cumbria to tackle the incident.
Two people were taken to hospital with suspected smoke inhalation and later released after treatment.
At the time BAE Systems said the emergency services response to the fire had prevented significant damage to the shipyard and the submarine units inside.
A spokesman for the Office for Nuclear Regulation said: “We are continuing to pursue regulatory enquiries into the incident. A multi-agency investigation involving police and other agencies remains ongoing.”
