50, 000 years ago Australia, Tasmania, and New Guinea were connected to form the continental land mass of Sahul. To populate this land mass more than 1000 people arrived, but this was no chance arrival.
To get to Sahul from Sunda, these people would have had to create a way of moving from island to island, have enough people to create viable populations, avoid treacherous weather, and have enough food and resources to survive when they got there. These are tasks that can not be left to chance.
Professor Corey Bradshaw from Flinders University explains just how technologically advanced these humans had to have been.