The Broads Authority said lessons have been learned six months after the explosion of a World War Two bomb in a Great Yarmouth riverbank.
The 250kg bomb exploded during slow burn disarming work shortly before 5pm on February 10.
A plume of dark-grey smoke ejected from the bomb three storeys high while a boom echoed across the borough. It signalled the end of a 77-hour ordeal for many residents, road users and emergency services.
No one was injured as a result of the explosion.
Following the explosion, Norfolk County Council launched an investigation to assess why the unexploded bomb had not been identified earlier during the construction of the Herring Bridge.
In June, it was declared no one was at fault.
However, the Broads Authority said lessons have been learned from the "near-miss".
A Broads Authority spokesperson said: "We operate a ‘continuous improvement’ process whereby safety breaches, near-misses and incidents such as this within the construction sector are assessed.
"Any learning is incorporated into our best practice and guidance going forwards."
The unexploded device was discovered just after 11.30am on February 7, during dredging work in the River Yare near the construction site of the third river crossing on Southtown Road.
A major incident was declared by police shortly after the device was found.
Within two hours, the bomb squad was called to investigate, and cordons were installed around parts of Southtown and South Quay.
Over the next three days, a 400m cordon was placed around the potential blast zone.
More than 200 people were evacuated from their homes and temporarily housed in evacuation centres.
An estimated 400 tonnes of sand was used to create a wall around the device in anticipation of the bomb being exploded where it was discovered.
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