One of the most identifiable structures of the Sellafield nuclear reprocessing plant has been dismantled.
The huge diffuser on top of the 125m (410ft) Windscale Pile chimney has been visible in west Cumbria for 70 years.
It had to be cut up in situ and brought down in sections, taking three years to take apart.
Project manager Geoff Carver said its removal had also removed the seismic risk of the chimney collapsing which was a “huge achievement”.
Sellafield said the work had been “hugely challenging” with much of it taking place during the pandemic.
Further work on the structure would be carried out after which the remaining chimney “barrel” would be demolished, it said.
The nuclear reprocessing site is being cleaned up by the Nuclear Decommissioning Authority (NDA) which said the diffuser’s removal was an “important milestone”.