Police found the male hiding on board the bulk carrier.
Cops stated the guy, 31, was dealing with a sexual attack charge in Sydney.
Team members signaled authorities after they observed the luxury yacht – which had actually been linked to the ship by means of a tow line – was likewise missing.
It stimulated a comprehensive search of the location by water authorities on Saturday and Sunday which found no trace of the guy.
Then on Monday, policeman with pet dogs expanded their search to the ship, which was anchored at Newcastle, 110 km (70 miles) north of Sydney.
After a few hours, they discovered the guy concealing inside an air-conditioning vent. He was bring a knife and about A$ 4,400(₤ 2,440; $3,050) in cash, authorities said.