Royal Caribbean's newest colossus has touched water for the first time. Hero of the Seas floated out of the Meyer Turku shipyard in Finland, with more than 90 million gallons of water needed to get the hull off the dock — and, per shipyard tradition, cannons fired to mark the moment.

When it debuts in August 2027, Hero will become the fourth Icon-class ship in the fleet and tie its siblings as the largest cruise ship in the world. Royal Caribbean has been releasing one Icon-class vessel per year since Icon of the Seas launched in January 2024, followed by Star of the Seas and Legend of the Seas. The pipeline doesn't stop there: the class will keep growing through 2030, eventually reaching seven ships.

The size race isn't slowing down either. MSC and Carnival both have ships in development that will rival the Icon class on capacity, so Royal Caribbean may need to go even bigger to hang onto its 'world's biggest' crown.

For travellers, the key detail is where Hero will sail. Unlike Legend of the Seas, which started out in Europe before repositioning to the Caribbean, Hero heads straight to Miami. It will run seven-night Eastern and Western Caribbean iternaries — bookable now — alongside Royal Caribbean's other mega-ships, which are all based in the region. Expect calls at the line's own private spots, including Perfect Day at CocoCay and ports with its branded beach clubs.

On board, Hero will follow the familiar Icon formula: distinct neighbourhoods across the ship, nine pools, 28 places to eat and a heavy lineup of entertainment. Full details are still to come, but anyone who has sailed or eyed up Icon or Star will know roughly what to expect — a resort at sea aimed as much at families and first-timers as dedicated cruise fans.

If a Caribbean week on the world's joint-biggest ship sounds like your kind of holiday, the practical takeaway is simple: itineraries are on sale ahead of the August 2027 launch, and early bookings on new Icon-class ships have historically meant better cabin choice and pricing. Note that Royal Caribbean fans closer to home are still waiting on the line's 2027-28 Australian programme, though the local fleet is set to grow to three ships for that summer.