BBC News Interactive viewer Andy Newton took these photographs of work being done to make the bomb safe.
A worker using a pile driver discovered the object 11 metres below ground.
An area around the site at Broadmead in Bristol remained shut late on Friday afternoon.
It is not known when the area will be declared safe.
Army bomb disposal officers decide how to make the object, now buried beneath the pile driver, safe.
The police helicopter offers an overhead view of what police have declared a major incident.
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