A WWII smoke mortar was destroyed on Llandudno beach by an Explosive Ordnance Disposal (EOD) team having earlier been found by a member of the public at the nearby Great Orme.
Having discovered the mortar – you guessed it, by magnet fishing – the local resident decided to take it to his place of work. Fortunately, the EOD team was alerted and they removed the device to the beach for a controlled explosion.
See: https://www.dailypost.co.uk/news/north-wales-news/dramatic-moment-bomb-experts-blow-15115237