https://mainichi.jp/articles/20170810/k00/00e/040/256000c
>>136778935
We're coming back for a third one Tojo.
>>136780622
They find them 2-3 times a year, usually in Okinawa.
>>136781399
But where any of those near a radioactive site?
>>136781865
Found it while setting up a parking lot, but depending on the size, it could be an issue. Plus, they have to dispose of it on a site full of radioactive soil and water tanks.