In real life we ' found ' a box of WD Hand Granades issued to me Grandad when we cleared his effects in 1980. Fortunately we knew the local Police Sargent...not in a official capacity you understand, and told him and he sent the Bomb Disposal squad from the local barracks and they floated the devices out onto the Firth of Forth and blew them up. . We were invited to view from a safe distance. It made the Evening News Paper ...
Moral is...don't mess with what you don't understand...