Malaysian volunteers are scouring a remote national park where a Hobart man went missing almost two weeks ago.
Andrew Gaskell, 25, told his family he would be hiking in Gunung Mulu National Park in Sarawak, with poor mobile coverage, for about a week from October 18.
He hasn't been heard from since.
Volunteers from a rural village that had contact with Mr Gaskell before he disappeared are searching the national park.
His family on Sunday said they were "overwhelmed" by the Malay people's "kindness and generosity of spirit".
"We urge anyone who is or was travelling abroad who knows anything, no matter how small, to come forward with the information," their statement said.
Tasmanian authorities will continuing working with their Malaysian counterparts and the Department of Foreign Affairs and Trade to find Mr Gaskell.