(CNN) -- When Felicity Aston started smelling fish and chips, she knew something was wrong. The unmistakable aroma of the classic British pub food, deep-fried fish and french fries, could only mean one thing: She must be hallucinating. After all, there are no pubs in the middle of Antarctica. The British explorer was skiing solo across the great frozen continent and had not seen another human being for weeks. "It drove me insane," said Aston. "It was like I was skiing along a huge row of fish and chips shops, the whole day." Read more: Global warming hits Antarctica, study finds
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British explorer Felicity Aston became first woman to ski solo across Antarctica
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She says the biggest challenge was coping with the long-term solitude
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Aston had to deal with hallucinations and frustration to complete the expedition
Being alone in the @placeholder means being on a high alert all the time.