Alex Dorr, a search and rescue pilot who was part of the team that found missing British backpacker Sam Woodhead, told ITV's Daybreak a helicopter was "scrambled out last night" as they searched in the dark with night-vision cameras in a bid to find him quickly.
He described the area Woodhead went missing in as "very harsh and unforgiving".
Dorr added: "Not that long ago we had a guy who was missing for a much shorter time and he passed away from dehydration."
More top news
Search teams were again looking for missing airman Corrie McKeague - this time joined by cadaver dogs trained to seek out human remains.
Donald Trump has dismissed pictures showing a smaller turnout to his inauguration compared to Barack Obama's in 2009.
Severe storms have ripped through the southern American state of Georgia leaving at least 11 dead and thousands without power.