7. P&O Iona
Lona is the largest cruise ship built to sail for any U.K based cruise line and is the seventh largest in the world. It measures 345 meters in length and has 17 passenger decks. At 185,000 Gross tonnage, Iona can accommodate 5,200 passengers and 1,800 crew members for a high-end hospitality experience.
Iona, another LNG-powered cruise ship from P&O Cruises, was set to launch in May 2020. However, because to the Coronavirus epidemic, delivery was delayed, and the P&O cruise only received it in October 2020.