The team building P&O Cruises’ 180,000 gross ton Iona, which will be powered by liquefied natural gas, making it the UK’s greenest ship, celebrated the milestone with the traditional coin-laying ceremony, the company said in a statement.

It was held at Meyer Werft in Papenburg in Germany on 14 June. Iona is the first of two similar ships to be built there for P&O Cruises, which is part of the Carnival Corporation & plc group. Iona will enter service next summer and the yet unnamed second ship in 2022.

“A bronze coin from the historic Iona Abbey and a slice of precious green Iona marble from the island were placed under the block housing the bow thrusters before the block was then lowered onto these items,” P&O Cruises said in a statement.

P&O Cruises president Paul Ludlow who attended the event said “This was an auspicious occasion in Iona’s build. The coin-laying is a long-held ship-building tradition which is to bring good luck to the ship and its crew through from construction to the future at sea.

“It is very special to think that a small part of the island of Iona will live within our own Iona. We hope that the qualities of beauty, heritage, pride, camaraderie, mutual support and loyalty from the island which attracted us to the name will be inherent in our ship, its crew and guests.

“The build of any ship is an incredible achievement but to see one of this size and scope is an extraordinary feat of skilled design and engineering. To view Iona’s SkyDome take shape was literally breath-taking – no other ship in the world has a glass dome of this quality of construction and scale. The extent of the space on Iona has allowed us to create not only spectacular spaces for shows, entertainment, dining and wellness but also many more intimate spaces for tranquility and relaxation as well as exclusive performances. Iona will be game-changer for holidays.”

As part of the ceremony the ship’s central steel block, the “mega block”, which has already been constructed was “floated out” on to the water. The 21.5 metre long block weighs 461 tons, is 19.4 metres wide and 9.8 metres high and had to be lifted by a 600 ton crane. The next steps are the block assembly of the bow and forward part of the ship in the dock as well as the further outfitting of the “mega block” in the harbour basin. In August, the “mega block” will be brought inside to the building dock and welded to the forward part.