Living on thin ice

On a cold Monday in December, one of Britain's most experienced polar explorers is sitting in an even colder room in Portsmouth, explaining his latest mission.

The temperature has been turned down to a mere -20C, tropical by comparison to the almost inconceivable conditions he will have to endure during his next expedition to the . There, temperatures can drop as low as -90C; it is dark all day or the sun can blind people in minutes; the explorers will wake up, their eyelashes frozen together,...

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