You look down and see giant shapes moving in the water beneath you’

A jellyfish sting? Ger Carty compares the painful sensation to a bee sting before correcting himself. “I’d say it’s probably more like a bad nettle sting, that’s how I’d describe it.”

He should know because when he climbed out of the sea at Sangatte, in 2011, hauling himself up onto the unwelcoming, rocky coastline of northern France, almost 19 hours after leaving England, his body was covered in them.

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