Where: Edinburgh and Liverpool

It's the kind of thing that you can cross off your 'list of things to do before I die' and can boast about for years to come. No matter how much you are assured that there's no chance you'll be eaten by a shark you'll skip a heartbeat or two the first time the shadow of a ten foot long shark emerges from the haze and materialises before your eyes, and the adrenaline will be unbeatable.

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