This is a regular problem in and around the Skageraak, where many WW2 German subs were sunk. However, the more pressing problem being not so much the ordnance still kicking around, as the chemicals in the batteries leaking out when the wreck corrodes, means this is the source of a number of heated debates in surrounding countries, as to whether to raise the wrecks or seal them up, to prevent environmental damage.
Very occasionally some old mines turn up around the UK coast and these do present a real danger to shipping. This of course is also the premise for the Russian submarine movie '72 Meters', in which a WW2 mine floats up and is struck by a Soviet sub (not a bad submarine movie, if you can find a copy incidentally).
Living as I do in the NW of England, where the Luftwaffe did much of its business, UXBs turn up every now and again, and the nearby channel out of the Mersey into the Western Approaches is another favourite for turning up German air-dropped mines every once in a while. I'd not want to be on board the Irish Sea high-speed Seacat ferry if it hit one of those babies, that's for sure!
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