A search is underway in a desperate attempt to find a "truly extraordinary" backpacker who vanished after visiting Yosemite National Park three days ago.
Alarm bells were raised when Hayden Klemenok, 24, who was part of a group, vanished on Sunday afternoon when he entered a Creek around 2pm.
There are some reports that Hayden may have got down on all fours to wet his head in the water before being swept away.
