In Germany WW2 bombs continue to go off at a rate of 1/year. We have to thank the Lord Lindemann and Bomber Harris for that - the two promoted the frankly idiotic idea of carpet bombing cities instead of armament factories, hoping that the population would overthrow Hitler. That at least was the official line.
What these two war criminals did was mix delayed fuze explosive bombs in with the regular incendiary and explosive load. The idea was to kill firefighters and interfere with the firefighting effort after a bombing run. Some of these delayed fuzes worked too well and instead of 4 hours after release they go off after 70 or 80 years.
> What these two war criminals did was mix delayed fuze explosive bombs in with the regular incendiary and explosive load
Even more hardcore than this, it was a common practice (e.g. it was done at Dresden) to do a second bomb run a couple of hours after the initial one, to hit the first responders. Of course none of that shit meaningfully impacted the duration of the war.
Funnily the Russians are doing the same now in Ukraine. People never learn, do they?
Its standard practice with insurgents and paramilitaries like FARC and the CIA drone squads in the oughties. One strike to hurt people and light fires, another a few minutes later to kill the first responders.
What these two war criminals did was mix delayed fuze explosive bombs in with the regular incendiary and explosive load. The idea was to kill firefighters and interfere with the firefighting effort after a bombing run. Some of these delayed fuzes worked too well and instead of 4 hours after release they go off after 70 or 80 years.