sentences:  In 1935 he was chosen by Lieutenant-Governor Hubert Murray to lead an expedition into the unexplored Great Papuan Plateau between the Strickland and Purari Rivers, with Louis James O'Malley as his second-in-command, along with 10 police and 28 carriers.It was the last major exploratory mission in the territory without radio or aerial support.They left Daru, on the south coast, by water on 1 January, followed the Strickland River and then its tributary the Rentoul River by canoe, leaving their boats about five miles below the confluence of the eastern and western branches of the river.