A SNAKE-obsessed adventurer has embarked on a dangerous solo expedition into the wilderness without food and extra clothing, telling authorities not to search for him should he not return.

Andrew Ucles, who calls himself the Snake Hunter, set off on foot from his Wollongong home a fortnight ago aiming for a 100-day trek to an undisclosed location in Queensland.

Desperate to raise awareness of conservation and wildlife issues, Mr Ucles, who names Steve Irwin as his hero, went against the advice of his friends and family to tackle the high-risk expedition.

Armed with just a tent, hunting knife, kayak and a video camera, Mr Ucles is determined to live off the land.

Close friend Alee Hadaya said Mr Ucles had no food or spare clothing with him, but would survive on what he finds in the bush.

"His greatest fear was people would try and stop him because it's a high-risk mission," Mr Hadaya said.

In a video recorded just before he took off, and posted on YouTube, Mr Ucles urged authorities not to rescue him should something go wrong.

"This is a personal choice of his, he'd prefer any money spent on rescuing him to go to Australian wildlife conservation," Mr Hadaya said.

Mr Ucles, who recently completed a science degree through the University of Western Sydney, has been a wildlife activist since a young age.

"He knows what he is doing, he is very experienced ... he's carried out some practice missions in the bush before he left, catching rabbits and fish," Mr Hadaya said.

Family and friends have not heard from the wildlife activist since he left two weeks ago, but will have to wait 100 days to see if he survives.

Mr Ucles posted a Facebook update on March 18 that read: "One decision can bring change, one step can start a journey, one person can make an impact. This is The Snake Hunter signing off."

If he survives in the bush, Mr Ucles is expected to make a documentary of his expedition, in a bid to raise awareness of wildlife and conservation.