Police are continuing an intense search of the Northern Territory's Larapinta Trail for a 64-year-old man who's been missing for 10 days.
Victorian man Alistair Thomson began hiking alone on the trail west of Alice Springs on May 13 and hasn't been heard from since May 21 when he sent a text saying he was planning to go to Hugh Gorge the following day.
Search and rescue members, police, local volunteers and Parks and Wildlife formed part of a full-scale search team on Wednesday.
Helicopters and other aircraft have also been called in to help.
Mr Thomson is reportedly an experienced hiker and authorities believe he left with "adequate" food and water.
Acting Sergeant Christopher Grotherr encouraged any members of the public who might know anything about Mr Thomson's whereabouts to get in touch with authorities.
"This is a large co-ordinated response between a number of agencies and volunteers, and I want to acknowledge and thank the efforts of all involved so far as we continue our search," he said in a statement.
"We are unable to conduct such operations without their invaluable assistance."
The Larapinta Trail is a 223km that runs along the West MacDonnell Ranges in Central Australia, with its eastern end at Alice Springs.
