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Former Operation Mend wounded vet continues tough trek to South Pole

On its website, expedition director Ed Parker said the teams were experiencing "a higher degree of stress" than expected. While the weather remains good, the terrain of ice and snow they are crossing is making the journey “very difficult, far harder than we anticipated.”

Wise is reporting on the journey for CBSNews.com. See his latest dispatch and those written by others, as well as videos, here.