There are some very worring news regarding young Australian that got missing at Sveti Ilija mountain:

“AUTHORITIES are concerned for the safety of a young Australian hiker missing in treacherous Croatian hills.

A massive search has been launched for Andrew John Modistach, who went missing last Thursday when he left a group of friends to walk up the 961-metre Sveti Ilija hill alone.
Local police in Peljesac say the last time the 24-year-old from Adelaide was seen was on Thursday afternoon walking toward the top of the hill near the village of Orebic.

Stipe Bozic, a Croatian mountaineer who has scaled Mount Everest, has joined the team looking for Modistach in hills which have claimed many lives before.

“It is not going to be an easy job to find him,” Bozic said.

“The last time we were able to detect a signal from his mobile phone was on Thursday.

“Many people have gone missing on this hill before, some of which were never found.”
The Australian embassy in Zagreb said it was aware Modistach was missing and Ambassador Anna George visited Peljesac on Saturday.

“There is not much we can say at the moment, but the Croatian rescue services are doing a great job in trying to find the missing Australian tourist,” George said.

Modistach was visiting the islands dotting the Croatian coastline with friends.

He was staying on the island of Korcula, the birthplace of adventurer Marco Polo, when he left the group to visit Peljesac.

More than 50 people, a helicopter and seven dog units continued the search for Modistach today”

(source http://www.news.com.au/story/0,10117,16572932-29277,00.html)