The size of 400 football pitches (and counting).
Might be a tad more radioactive, carcinogenic and generally toxic than an old slate quarry for swimming in. I'd give it a couple of centuries if I were you.
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brb Monkhouse Stampede, Mon 20 Nov 2023, 21:06,
Reply)
but by then i'll be too old to swim!
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Snorty McBumhole YouTube.com/MinistryOfGeeks, Mon 20 Nov 2023, 21:36,
Reply)