Oops. I hate it when that happens. Here in US we have been closing down redundant military bases for a few decades, and sometimes houses get built over old bombing ranges or caches. A town near Sacramento got a scare a few years ago when somebody working at the rail yards dug up an old bomb that had been overlooked from a transport accident decades earlier. This time there was no explosion, thank God. Another town near here allowed a real estate developer to build a housing complex in an area that partially overlapped an old testing ground for a closed military base. I think the military may have cleaned out the old ordnance before releasing the land. Maybe. If I lived near there, I certainly would not dig very deeply into my garden. With all of the turmoil of World War II in Russia, there must have been dozens or maybe even hundreds of bomb caches. Hopefully the bomb disposal experts will be successful in cleaning them up without any deaths.