Swimming in deep water can feel a bit creepy, but I suppose it makes no difference whether it's 2km or 8km. I also find swimming above dark patches (of e.g sea weed), close to cliff edges and where a beach slopes rapidly downward into an impenetrable abyss a bit creepy too.
BBC News - Blue Peter's Andy Akinwolere sets two swimming records
BBC News - Blue Peter's Andy Akinwolere sets two swimming records
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