Well done that army team in keeping everyone safe. They had it swaddled in sandbags because it had been determined there was a high risk of it going off during the operation. Fortunately, only a robotic was working on it at the time.
I lived there until the early eighties. Although it's not a particularly big place, it's a little known fact that Gt Yarmouth was the most frequently attacked coastal town in Britain during WWII in terms of number of raids by the Luftwaffe, with 90 raids in total.
As well as targeting its naval shore base and the minesweepers and torpedo boats operating from the port, planes returning from other raids used it as a navigation way-point and would unload any leftovers on the town as they crossed the coast. Returning bombers didn't want to land with any ordnance still in the bomb-racks.
This particular bomb is believed to have been from the midnight raid of 8/9 April 1941 when 4,000 incendiaries were dropped on the town along with high explosives. Six HE bombs (believed to be 250kg) were reported to have landed in the river but accompanied by only five explosions. The Home Guard ultimately abandoned their search for the unexploded one.
