How are WW1 or WW2 era bombs still regularly found in gardens and houses around UK and Europe?

Question

The day after or week after these were dropped 60-100 years ago, did people not think, there’s a bomb over there we should make it safe.

Edit: I singled out the UK because they discovered a bomb from World War Two today in Plymouth. I know the UK is still in Europe.

In: Other

Answer 1

Hamburg was heavily bombed at night. Before any building construction starts, the place has to be checked. Regularly blocks in the city are evacuated until the bomb to be secured. We get alarms on the mobile, etc. Nothing unusual. It is in 5he lqw, you can not construct before checking. There are still many many bombs here. Same thing for windoffshore parks, the undersea ground will be checked. Munitions etc. were discharged in the sea.