Construction workers building Royal Caribbean’s newest ship Spectrum of the Seas have lowered the vessel’s keel into place.

The keel-laying ceremony took place on Thursday at Neptun Werft shipyard in Rostock, Germany.

A 620-tonne block measuring 59 feet by 121 feet was lifted into the building dock with a crane.

Spectrum, set to debut in 2019, has been designed for guests in China and the Asia-Pacific region.

When Spectrum of the Seas launches it will join Quantum of the Seas sailing the region.

The 4,200-passenger ship will be larger than its Quantum-class shipmates, measuring 168,800 gross tonnes.

All the Quantum-class ships carry the same number of passengers.

The first steel pieces of Spectrum were cut to size in the shipyard’s laser centre in August.