"We're going to keep the pressure on," the Chelan County Sheriff told USA TODAY June 12 as he prepared to board a helicopter to help in the search.

Chelan County Sheriff Mike Morrison said police officials hope Decker soon runs out of supplies, surfaces and makes some kind of bold move that gets him caught.

Travis Decker's not some unstoppable rugged action hero, according to the Chelan County Sheriff ... 'cause it's the terrain -- not his military training -- that's helping him avoid capture.