They keep finding WW2 Anti Aircraft Shells washed up in the mud in my neck of the woods. The navy sends out a team on what seems like a regular occurrence. They were talking of doing a 'sweep' to deal with them once and for all. I seem to remember an article I read from around 1968, re the last unexploded Luftwaffe bomb found in London. There have been plenty since then and probably more to be found. C'est la Guerre....