I think now there's an incident with deaths every few years, e.g. last I could quickly find were 2014 (excavator hit one on a construction site, driver killed) and 2010 (3 bomb disposal workers killed while prepping a bomb to be disarmed).
[1] https://www.goettinger-tageblatt.de/Nachrichten/Panorama/Goe...
[2] https://www.goettinger-tageblatt.de/Nachrichten/Panorama/Goe...
Update: Around 7000 people were evacuated before the disarming took place.