Come in, the water's f-f-freezing: Endurance swimmer Lewis Pugh is preparing for his toughest challenge yet... in Antarctica

Is he mad, or simply superhuman? HARRY MOUNT takes the plunge with him to find out

Lewis Pugh will swim a kilometre across a 'supraglacial' lake in the Antarctic. 
His swim will last between 18 and 21 minutes: enough to kill most human beings.  
The endurance swimmer has trained off the Isle of Lewis in the Outer Hebrides.

He hopes to create a network of protected marine sanctuaries in east Antarctica.

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