"experienced" is a very elastic term. It doesn't mean "immune" or"impervious". It does mean that an experienced outdoorsperson is less likely to get into trouble. As always, full details are helpful in really understanding the situation.

Here is yet another case of an "experienced, fit" individual disappearing. It doesn't look good for him. http://www.vcstar.com/news/2014/jun/24/no-new-clues-in-search-for-missing-firefighter/
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Geezer in Chief