Mungo Man: 42,000-year-old Aboriginal remains to be reburied

[wnylib]

4. Rafts, maybe? Large canoes?

In much more recent times, the Polynesians used double canoes out on open ocean.

The original inhabitants of Australia did not have to cross open sea. During glaciation periods, water levels everywhere were lower. As the Wikipedia links says, Southeast Asia and current islands there were connected as one land mass except for a narrow straight between that land and Australia. So crossing a straight would not have been as foreboding as open ocean travel.