Basically you get a very strong magnet and tie a long rope to the magnet. Then you throw the magnet into a lake or river, drag it back and see what exciting metal objects you have caught. Location is key with this though, a bridge over a river or canal in a town or city will obviously have more treasure like coins, rings, phones etc then one in the countryside. All we got from the park lake was a bike tire, half a clothes line pole, numerous nails and the side panel from a motorbike bizarrely !COFFEEA

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