[sbsudbdjd]

(Aside on why I appear blasé: I grew up riding across a heavily trafficked bridge to get to school that was aggressively but unsuccessfully bombed by the allies. They once found a big one and closed the bridge for a few days while they removed it, but there's no reason to believe that there aren't more to be found buried in the mud.)

Well they didnt go off when they were supposed to and haven't gone off in 80 years -> there's a good chance there's something about them preventing them from going off.

The main danger is that disturbing them could remove the inhibitor. Also, age can make them unstable.

This is why we blissfully ignore the known unknown bombs that are everywhere in Europe but are extremely careful when we discover and try to remove one.