After 1945, the passenger market declined to India, but boomed to Australia with the advent of paid-passages for literate and healthy European immigrants known as Ten Pound Poms. P&O built 15 large passenger liners, including , , , and , culminating in and , which were an unprecedented speed and size. By 1968, over 1 million immigrants had arrived—many via P&O—and Australia ended the programme. P&O entered the cruise market and began to sell and scrap many of these liners. It concentrated mainly on cargo ships. It entered the tanker trade in 1959 and the roll-on roll-off (RORO) ferry business in the mid-1960s.