When Royal Caribbean’s Harmony of the Seas debuted in 2016, it was the largest cruise ship in the world, carrying 5,479 guests at double occupancy and as many as 6,780 at capacity. Rather than a reinvention of the brand, this ship is part of the Oasis class but contains select elements of Quantum class — namely the Bionic Bar and larger staterooms, including Inside Staterooms with virtual balconies — blending highlights from each to create a new experience.