Greece's military has successfully deactivated an unexploded bomb from World War II found under a gas station Sunday morning in Thessaloniki. The large explosive prompted the evacuation of estimated 75,000 people in the country's second-largest city. While the scale of the evacuation one of the largest for a Greek urban area during peacetime, unexploded munitions from past wars have been a constantly recurring problem across Europe over the past several decades. The sheer amount of bombs and other explosives used during World War II in particular have prompted a steady stream of discoveries of unexploded devices every year since the war ended.