His theories prompted a number of expeditions in search of this mythical land, until James Cook's second journey (1772–1775) led to the conclusion that, if it did exist, it was further south than the 65° line of latitude South.
Hans teorier afstedkom flere ekspeditioner, som søgte efter det mytiske land, indtil James Cooks anden rejse (1772–1775) førte til den konklusion, at hvis det eksisterede, måtte det ligge syd for 65° sydlig bredde.