alt Hacker NewsAnd the mother of all unexploded WW2 ordance is the SS Richard Montgomery.
1.4kt of explosive sat in the Thames Eastury, 35 miles down river from central London, that nobody knows how to get rid of.
"it was determined that if the wreck of Richard Montgomery exploded, it would throw a 300 metres (980 feet)-wide column of water and debris nearly 3,000 metres (9,800 feet) into the air and generate a wave 5 metres (16 feet) high. Almost every window in Sheerness (population circa 20,000) would be broken and buildings would be damaged by the blast."
Isn't that a kind of thing you just have to bite the bullet and deal with directly, because waiting only makes dealing with it more expensive with time?
Just evacuate the people and blow it up, accepting that it'll inconvenience a lot of folks and the national budget even more, but will also briefly revitalize the local economy, as every contractor there is will maximize the opportunity to suck out the funds set aside for repairing buildings damaged in the explosion - and make sure to record the disposal itself from every possible angle, with most expensive cameras government can buy, as selling clips of it to the media industry would be a licensing goldmine and recoup some of the costs.
Hell, turn it into a spectator event, and tourists coming to see it may just pay for the whole thing.