The keel was laid for the Spectrum of the Seas on Thursday as it was was lowered into place at the Neptun Werft shipyard in Rostock, Germany.
The keel-laying signifies the beginning of the ship's physical construction, said Royal Caribbean.
During the ceremony, a 620-ton block measuring 59 feet by 121 feet (18 x 37 meters) was lifted into the building dock with an 800-ton crane.
Set to debut in 2019, Spectrum "will be the next evolution of the cruise line’s groundbreaking and high-tech Quantum class of ships placing the ship in a new class of her own called the Quantum Ultra," according to Royal Caribbean.
The ship will specifically be designed for guests in China and the Asia-Pacific region, and will feature cutting-edge and unprecedented experiences and amenities.