The state of Queensland has been battered by heavy rains in recent weeks and the rising water levels have led to a mass evacuation of towns in the area and the country's third largest city, Brisbane. At least 22 people have died and more than 40 remain missing.
Cameron is currently Down Under promoting his new movie Sanctum 3D, which was filmed in Queensland and tells the story of a group of cave-divers caught up in a violent storm.
The Titanic moviemaker, who acted as an executive producer on Sanctum, admits he's stunned by the scenes of devastation he's witnessing in Australia, telling the AAP, ""People always underestimate the power of water. Water can crush you. Whether you spend a lot of time in the water or underwater, as we have in the ocean, or indeed made films when you have to move large amounts of water around, people always consistently underestimate the power of it.
""I think that gives us collectively a great respect for what people are up against in Queensland and, of course, our hearts go out to people who are losing their homes. The scope and scale of it is really horrific.""
Sanctum's director, Alister Grierson, adds, ""It's a frivolous pursuit, in a sense, what we do for a living - so it's difficult to compare to people's real lives. And we've all got friends and family in Queensland who are suffering through this.""