Over 170 World War II bombs were discovered last month at a children’s park in northeastern England during construction while the park was being renovated. 

Several workers found the explosive devices while working on Scotts Park playground in Wooler, a town in Northumberland, England, according to reports. The first bomb still had a charge when discovered, but it did not detonate. So far, 176 bombs have been recovered in the area, and excavators are expected to find many more. The first bombs were found on Jan. 23 during a park survey.